Nick Jonas  and Olivia Culpo looked straight out of a magazine in Las Vegas on Saturday. The couple linked up with Joe Jonas  to celebrate his 25th birthday. In other can't-miss moments, Ben Affleck  and Jennifer Garner  blended in with the crowd at a coffee shop, Leonardo DiCaprio  showed off his thick beard, and Adam Levine and Behati Prinsloo took their newlywed bliss out on the town. Scroll through to see all that and more in the weekend's must-see snaps!
Leonardo DiCaprio  had a serious beard when he popped up at Oceana's Annual SeaChange Summer Party on Saturday.
Britney Spears  brought her A-game to her Piece of Me concert in Las Vegas on Friday.
Alyssa Milano  positively glowed while holding her baby bump at Disney Junior's Pirate and Princess: Power of Doing Good event in Pasadena, CA, on Saturday.
Lea Michele  flashed a smile while hiking in LA with a girlfriend on Sunday.
Newlyweds Adam Levine and Behati Prinsloo stepped out in West Hollywood, CA, on Saturday.
Lady Gaga  received a stuffed panda toy from a fan in Perth, Australia, on Sunday.
Brody Jenner sported a mustache and scruff at the Hard Rock Hotel and Casino's Rehab pool party on Saturday.
Barbra Streisand, joined by her husband, James Brolin, hung out with Jamie Foxx , Grace Hightower , and Donna Karan  in East Hampton, NY, on Saturday. The group gathered at the Apollo in the Hamptons event.
Cate Blanchett  was all smiles in NYC on Saturday.
Jennifer Garner  and Ben Affleck  grabbed some cold beverages in LA's Brentwood area on Sunday.
Rachel Bilson 's baby bump was front and center while the actress picked up a rocking chair in LA on Saturday.
On Saturday, Justin Timberlake  smiled at the audience during his performance at the V Festival in Chelmsford, England.
Jared Leto  went for a bike ride in NYC on Sunday.
On Saturday, Joe Jonas  partied with his girlfriend, Olivia Culpo, at his brother Joe's birthday celebration at XS nightclub in Las Vegas.