The Biebers served up some major star power at the U.S. Open Friday night … prompting a shoutout from tennis great Coco Gauff -- and paving her way to victory.
Justin and Hailey were kicking back in their box seats at Arthur Ashe Stadium, watching Coco battle Elise Mertens in the third round of the women's grand slam tournament.
Hailey looked like her beautiful self in a trendy leather coat … but Justin stole the show with his funky pink glasses and polka-dot black cap turned back around.