Leighton Meester threw on her exercise clothes to take her dog for a walk in LA yesterday. The Gossip Girl actress is out West during a hiatus from working on her hit show — she and her cast mates actually wrapped up shooting the fourth season recently. There are still new episodes airing on the CW, and last night brought our latest installment of the Upper East Side drama and OMG moments with "The Kids Stay in the Picture." Leighton's Spring and Summer will still be busy with work, and we can see her in action in the new trailer for Monte Carlo, which is out in July, and The Oranges later this year. April 8 was also her big 25th birthday, and FabSugar celebrated with a look back at Leighton's signature style. She may have gotten a special present in the form of a new role, as Leighton's rumored to have signed on to star in I Hate You, Dad with Adam Sandler and the one and only Vanilla Ice.