the voice singer blonde avalon hollywood Christina Aguilera

Christina Aguilera and her boyfriend Matt Rutler are lovebirds who love a good after party!

The twosome celebrated The Voice finale at Avalon in Hollywood. Xtina, still rockin' her false lashes from the taping, also sported some short shorts and fishnets.

We couldn't help but notice that she was wearing one of her favorite tees with a topless Heidi Klum on the front. The singer wore this shirt more than two years ago while taping her cameo for HBO's Entourage.

Great to see that Xtina is a recessionista ... recycling old clothes!