Did Selena Gomez Pound One Too Many Birthday Jacks? (watch!) Keith GirardJuly 24, 2013 Selena Gomez turned 21 on July 22 and partied hard with her close friends, including her first “legal” drink. She told Jay Leno she downed a “shot of Jack,” meaning Jack Daniels Whiskey, which seems to be the drink of choice for rock and rollers.... CELEBRITIES