Justin Bieber got touchy feely with his girlfriend Selena Gomez when he made his way to the National Building Museum in Washington, DC over the weekend. The teen singer was seen sneakily grabbing her backside when heading to the building to rehearse his upcoming performance at "Christmas in Washington" concert.

Bieber wore a gray sweater with black and red strips, a pair of dark jeans and sneakers. Completing his look with a beanie, the Canadian star clutched a bottle of mineral water in one hand and a cell phone in another. Selena, meanwhile, kept herself warm in a long-sleeved jacket, jeans and knee-length heeled boots.

The concert was held one day after the rehearsal. The "Fa La La" singer suited up when performing in front of President Barack Obama and his family at the holiday gig which benefits the Children's National Medical Center. He was joined by the likes of Cee-Lo Green,...