While fans were out enjoying their BBQs during Memorial Day weekend in the States, T-ara N4 spent the holiday with stars Chris Brown, Wiz Khalifa, and Amber Rose.

The girls didn't forget to take proof shots as they hung out with these big names backstage at the 'Memorial Day Weekend 2013' concert held in Las Vegas.

Producer KNOTCH who worked with Justin Timberlake, Jay-Z, and more, also entertained the crowd with his remix of "Countryside Life" while he was entertaining as a DJ on stage.

T-ara N4 also had their chance to stand on stage at Vegas with "Countryside Life" during Chris Brown's Palms Pool show.