Someone had a blast celebrating their birthday across the pond last week! Either that or Selena Gomez is headed straight to Justin Bieber's house for a booty call...

On Tuesday evening Selena landed at Los Angeles International Airport after spending the last week in London, and she was all smiles as she walked through the terminal and headed to her chauffeured SUV. We love to see her like this, but we do have to wonder why she's in SUCH a good mood!

So what all did SG do when she was in the UK? She turned 23 last Wednesday last, and that night she partied with her girlfriends at Beach Blanket Babylon in Notting Hill, and after relaxing for a few days, the festivities continued at the Savoy Hotel, where she was served tea in the Thames Foyer. Fancy! And she wasn't done! On Monday the singer/actress spent her final night at Chiltern Firehouse. Sounds like she needs a vacation from all that partying!

Maybe she'll stop by Bieber's pad for a little R&R? You KNOW Jelena isn't over yet...