Selena Gomez Wardrobe Malfunction PHOTOS: Birthday Girl Flashes Underwear & Sexy Legs Amid Tommy Chiabra 'Puppy Dog' Crush

Selena Gomez celebrated her 22nd birthday in style - and exposed some major skin in the process!

While partying in Saint-Tropez with a slew of friends (including model Cara Delevingne), Gomez attended the Leonardo DeCaprio Foundation Gala. The "Come & Get It" songstress flaunted a beautiful olive green gown that accentuated her stunning figure:

Gomez traveled by boat and car to the star-studded event. The slinky, high-slit frock definitely turned some heads - especially when Gomez appeared to flash her nether-regions!

Check out the minor fashion mishap here. Was Gomez even donning any undies?

Meanwhile, rumors suggest that Justin Bieber's ex has a new leading man in her life - Tommy Chiabra!

An alleged HollywoodLife.com source reveals that Gomez's crush is growing:

"Selena definitely has a puppy dog crush on him that is only intensifying because he isn't taking the bait... He knows he has her but is currently going the friend route even with all the obvious flirting that is going on." 

New couple alert?