Robert Pattinson stepped out solo carrying a bag as he left a Manhattan clothing boutique today. Robert is hanging out on the East Coast, though he's apparently putting down roots back West. Robert recently purchased a $6 million mansion in LA's Los Feliz neighborhood, and according to reports, he and girlfriend Kristen Stewart have already moved into the house, which was previously owned by actor Noah Wyle. Rob and Kristen partied together over the weekend with fellow actors like Miley Cyrus and Liam Hemsworth at a pre-Academy Awards party thrown by WME agent Ari Emanuel. Rob and Kristen skipped out on this year's annual Vanity Fair Oscar soiree; however, she slipped into a few designer pieces earlier today for a fashionable appearance in France. Kristen wore leather pants to sit front row at Balenciaga during the brand's Paris Fashion Week presentation while Rob took care of business in NYC.

Kristen Stewart wore jeans and a black jacket to lunch at Le Duc in Paris this afternoon. She didn't waste any time changing into a more casual outfit after donning leather pants at the Balenciaga show. Kristen stepped out in the stylish look to attend the Paris Fashion Week runway presentation alongside Salma Hayek and Charlotte Gainsbourg. She arrived in France yesterday, after spending the weekend in LA with boyfriend Robert Pattinson. Kristen and Rob celebrated the Oscars together at the WME agency party, though in previous years they've separately attended Vanity Fair's bash.

Kate Middleton looked ready for Spring in gorgeous bright blue as she stepped out alongside the Queen and Camilla, Duchess of Cornwall, for tea at Fortnum & Mason food store in London today. Catherine, Duchess of Cambridge, wore a jacket by Missoni, pumps by Rupert Sanderson, and accessorized with two yellow daffodils on her lapel in honor of St David's Day. The trio of royal women were presented with special picnic baskets in honor of the Jubilee. Inside the upscale department store, Kate reportedly indulged in chocolate, confessing to the staff that like most girls she has a sweet tooth.

The gift baskets Catherine, Camilla, and the Queen received reportedly included dog biscuits, which may have been specially included with Kate and William's new puppy Lupo in mind. Catherine has been coming into her own with solo appearances while her husband Prince William is on duty in the Falklands. The Jubilee events and her charity work have kept her busy, but she has her own special occasion around the corner as well — Kate and William's first wedding anniversary is just two months away already.

Justin Bieber turns 18 years old today! It's a big milestone for the star, who was just 15 when his hit "One Time" put him in the spotlight. His career has continued to soar, but his relationship with Selena Gomez has also made headlines. The musical duo first stepped out publicly as a couple at Vanity Fair's 2011 Oscar party and since then have been happy to share PDA, pose on red carpets together, and get cozy on the beach.

Click through to see Justin's sweet moments with girlfriend Selena as we celebrate his big birthday!

Natalie Portman took her son, Aleph Millepied, along for a hike in the Hollywood Hills today. Natalie and her little one joined a couple of female friends to get some fresh air on the trail. The low-key outing came after Natalie's appearance at Sunday's Oscars, where she presented Jean Dujardin with his best actor honor. Natalie took home the best actress award herself last year for her role in Black Swan.

Since then, the new mom has been taking a break from her work, but she will make her return to film with two new projects by filmmaker Terrence Malick. Last month, it was announced that Natalie will join forces with The Tree of Life director on his next movies Knight of Cups, which is set to feature Christian Bale and Cate Blanchett, and Lawless, which will star Christan, Cate, Natalie, Rooney Mara, and Ryan Gosling. Natalie's newest role, however, is as wife to Aleph's father, Benjamin Millepied. The Oscar winner debuted a gorgeous new diamond ring on the red carpet at the awards ceremony, and her marriage to the ballet dancer and Black Swan choreographer was confirmed by sources shortly after.

While many celebs were prepping and partying together at the Oscars, even more stars took to Twitter to share their fun and funny photos from the week. Oprah tweeted a photo from her appearance on Jimmy Kimmel Live, Mariah Carey hung out with a baby kangaroo, the boys of 21 Jump Street took flight on a press tour, and Zach Braff shared a sweet photo while reading a bedtime story to his niece. Click through to see all the Twitter snaps, and don't forget to follow PopSugar on Twitter for the latest.