Watch Christina Aguilera impersonate Rihanna, Adele and more pop stars

Christina Aguilera is singing a new tune these days. The Voice judge dropped by the Ellen DeGeneres Show on Monday (May 16) to show off a very special hidden talent - impersonations. From Rihanna to Whitney Houston to Adele, the 35-year-old nailed their famous voices during a game of Heads Up.

The singer also revealed that her eight-year-old son Max is a huge fan of parkour and that she is struggling to accept his fearless new hobby.

"Max is into this new sport a.k.a free running, parkour. It's all these crazy men jumping off of buildings and stuff. He's just like this little acrobat," Christina told Ellen. "He'll be in Cirque du Soleil one day or something, he's just that guy."

TAP FOR GALLERYChristina Aguilera has revealed that eight-year-old Max is into parkour.

As Ellen showed a video of Max in action, Christina said: "Look at him, training already to jump off of buildings one day and give me a heart attack - it's awesome!"

Max's interest means that he isn't particularly interested in his mom's starring role in The Voice. But there is one show he would love to see her do.

Christina is also mom to one-year-old Summer Rain.

"He couldn't care less that I'm on The Voice - the chairs, the whole thing, he couldn't care less," she smiled. "But if I was on American Ninja Warriors he would literally want to come to work with me every day. Then I'd be cool, the cool mom."

Christina also spoke her daughter Summer Rain, who will be two in August. "She's swimming right now," she revealed. "Already. I know, it freaked me out a little, but it's actually a safety thing!"

Christina has been engaged to Matthew Rutler since Feb. 2014.

Christina welcomed Summer with fiancé Matthew Rutler in Aug. 2014. The couple have been engaged since Feb. 2014.

Max, meanwhile, is her son from her first marriage to Jordan Bratman. The couple dated for two years before tying the knot in Nov. 2005 in Napa County, but the couple split in Oct. 2010, and their divorce was finalized in Apr. 2011.

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