Selena Gomez Flashes Underboob in Skimpy Pink Bikini in Mexico

Selena Gomez sizzled in a teeny pink bikini in Puerto Vallarta, Mexico, while playing in the water on Tuesday, April 14.

During her fun excursion with friends, the multi-hyphenate got rowdy in the water and flashed some underboob in her sexy (and very skimpy) bikini top. See the pics on Us Weekly