Jayden James Spears Federline

Britney Spears wore a bikini yesterday to swim in the pool of her Buenos Aires hotel with her sons. Jayden James and Sean Preston Federline were able to spend more time splashing around with Brit and her boyfriend Jason Trawick following a similar afternoon last week in Rio.

Britney's Femme Fatale tour moved on to Buenos Aires from Brazil, and after her Argentine show last night, Britney tweeted, "So much love — thank you Argentina!" She will be in Chile tomorrow, and Peru, Columbia, and Venezuela are up next before she moves on to Mexico and the Dominican Republic. Her last show of the year is Dec. 10 in Puerto Rico, and then Britney has two weeks to relax before celebrating Christmas with her family! Before returning to the US, though, Britney will ring in her 30th birthday on Dec. 2.

Britney Spears was in a bikini yesterday to play at the pool of her Rio hotel with boyfriend Jason Trawick and her sons Sean Preston and Jayden James. Her mom Lynne was also in a two-piece for the splashing session, and the girls stuck together while Jason horsed around with Jayden and Sean. The Spears clan is in Brazil as Britney takes her Femme Fatale tour through South America. They arrived in the city over the weekend, with Sean and Jayden not wasting any time before exploring the town. Britney's dad Jamie took the little ones to the beach, where they were seen running on the sand and testing the waves. It'll be back to work soon for Britney, as she'll take the stage tonight at Rio's Apoteose and will be in Sao Paulo this weekend.

Britney Spears waved to fans from the balcony of her hotel in Rio de Janeiro today. Britney is kicking off the South American leg of her Femme Fatale tour in Brazil and will continue through the continent for the next couple of weeks before wrapping things up in Mexico and Puerto Rico in early December. It's been a long international road for Brit, but luckily she has her main men around to ensure she doesn't get too homesick. Britney's boyfriend, Jason Trawick, joined her on the balcony this morning, and he's stuck by her side for all her shows. Britney skipped the beach, but on both Friday and Saturday her sons, Sean Preston and Jayden James, hit the waves with their grandparents Jamie and Lynn Spears.

While Britney is on the road, she had some fun news to celebrate back at home this week — Britney is nominated for a favorite album of the year People's Choice Award!

Britney Spears celebrated Halloween with her sons Sean Preston and Jayden James as well as her boyfriend Jason Trawick and her mom Lynn Spears in London last night. Britney twittered a picture of her sons' costumes, which were Batman for Jayden and a ninja for Sean Preston. Britney was decked out in one of her Femme Fatale costumes and Lynn was a witch, while Jason skipped putting on any dress-up gear. Britney is currently in the midst of the European leg of her tour and Joe Jonas is her opening act for these overseas dates. Britney gave Joe Jonas a lap dance during the interactive part of the show which has previously had her wrapped around Pauly D from Jersey Shore as well as her real-life love Jason. Mr. Trawick also recently starred in Britney's very sexy "Criminal" music video, though it looks like this year the two skipped any couples costumes for their Halloween festivities.

Britney Spears continued her mini--vacation on Long Island with an afternoon of boating yesterday. She affectionately held onto her boyfriend Jason Trawick while her sons Jayden James and Sean Preston played down on the deck. On Wednesday, Jason and Britney brought her sons to the beach and an ice cream truck. Britney is back in business on tour tonight in New Jersey, and she continues nonstop through August. Brit then has a month break, which hopefully means an appearance at the VMAs where she has two nominations, before embarking on her European and South American tour in the Fall. It was just announced that Britney will have a new tour partner in Joe Jonas when she heads abroad in September.

Kevin Federline packed up the kids, Sean Preston, Jayden James, Kori, and Kaleb, and headed to Malibu on Tuesday with his pregnant girlfriend, Victoria Prince. Victoria broke out her bikini for the day trip and cozied up to Kevin for a few photos. Sean Preston and Jayden James have had their fair share of time in the sun this Summer; they recently returned from a fun-filled vacation in Texas with Lynn Spears. Kevin and Britney are sharing custody of the boys while she's touring the States with her Femme Fatale show, and at the moment Jayden and Sean are hanging with Kevin. The boys can look forward to the impending birth of their new half sister, Jordan Federline, which Kevin and Victoria are expecting any day now.

The extended Spears family hit the pool at the Four Seasons in Houston yesterday while Britney was off prepping for a show on her Femme Fatale tour. Her sister, Jamie Lynn, threw on a bikini to swim with her toddler, Maddie, while Grandma Lynne Spears was in a swimsuit, showing off her amazing figure in the water with Jayden James and Sean Preston. Jason Trawick even stepped out to say hello to the gang, though he wasn't dressed for swimming in a pair of sneakers and a knit cap. Britney and Jamie Lynn's dad, Jamie, emerged to sit on deck chairs and eat with the family, too. It seems Britney's nearest and dearest have been able to join her for the southern leg of her travels. The Spears were soon off to New Orleans for Britney's next show. There weather in her home state of Louisiana wasn't as nice, since Britney tweeted about it being a rainy day. That didn't stop Jamie Lynn from heading out to shop, and she shared a photo with her Twitter followers of a funny shirt she spotted. Britney has today off, and then it's back to California for a show tomorrow in Sacramento.

The whole Spears-Federline gang came together yesterday to cheer on Sean Preston at his Little League game in LA. Britney, who hosted KISS FM's Wango Tango concert alongside Ryan Seacrest on Saturday, traded her tight Herve Leger party dress for casual sweats during the family day. She was joined by boyfriend Jason Trawick to sit behind the plate, while Kevin Federline coached the team and his girlfriend, Victoria Prince, played with Jayden. Britney Spears is on the June cover of Harper's Bazaar and chatted about her upcoming North American tour in the accompanying interview. Britney spoke about how being a mom has affected her career decisions, but she went on Twitter to reveal that her favorite single from new album Femme Fatale is the new tune "I Wanna Go."

Britney Spears and her sons Sean Preston and Jayden James got special backstage access after checking out The Lion King in Las Vegas yesterday. Brit and her boys picked up a few souvenirs, which they had in hand when they posed for a picture with the cast. Britney was finished in time to be settled in to watch her I Am the Femme Fatale special on MTV, which most of you were curious to check out. It was an exciting way to wrap up Britney's big week, which ranged from the huge GMA performance to her Porta-Potty filled and sexy stop by Jimmy Kimmel. Brit's new album is getting great reviews and now she's gearing up for a US tour even without Enrique Iglesias by her side.

Britney Spears packed up her sons, Jayden James and Sean Preston, and ventured out to a mall in rainy LA yesterday. The trio did their best to stay dry by ducking into a Gymboree. Brit's been spending lots of time with the boys, but she may miss out on Sean Preston's Little League game this weekend since she's scheduled to take the stage in San Francisco for a live performance. She's already showed us her dancing skills in video for Hold It Against Me, the first video from Femme Fatale, and she'll put her moves on display during the five song mini concert. The show was originally scheduled to take place outdoors, but due to a stormy forecast, organizers have moved the event indoors to Bill Graham Civic Auditorium. Good Morning America will tape the event and air the footage Tuesday morning, the same day her album drops!