Justin Bieber is seen being playful with girlfriend Selena Gomez by grabbing her tush in Washington, DC.

Justin Bieber is seen being playful with girlfriend Selena Gomez by grabbing her tush in Washington, DC.

Justin Bieber and Selena Gomez arrive to rehearse for the Christmas in Washington Concert at the National Building Museum in Washington, DC.

Justin Bieber and Selena Gomez arrive to rehearse for the Christmas in Washington Concert at the National Building Museum in Washington, DC.

Justin Bieber and Selena Gomez arrive to rehearse for the Christmas in Washington Concert at the National Building Museum in Washington, DC.