7-9 Approach her in the lobby

You move across the room twoards Rose. She spots you and flashes a big, cute, smile. "Hey you! You look good in a tux, dude."

"Thanks, looking pretty good yourself. It's a shame you don't have a date here to appreciate it."

"I may not have shown up with a date but I sure as shit intend to leave with one." With that she gives you a wink.