Kristen Bell's Daughters Keep Pulling the Most Savage Pranks on Her and Dax Shepard

It sounds like practical jokes run rampant in the Bell-Shepard household — as if we expected anything less. When Kristen Bell stopped by The Ellen DeGeneres Show Friday, she and guest host Ken Jeong got on the subject of how her daughters, 4-year-old Delta and 6-year-old Lincoln, are turning into quite the savage pranksters. "They really keep us on our toes . . . [it's] exhausting but I'm also like, 'Oh, you're developing a sense of comedy; I love it,'" the 39-year-old actress said on the talkshow. (And yes, Kristen is, in fact, 39 years old, despite what her kids think of her age.)

Kristen went on to reveal a few of the funny jokes Delta and Lincoln have pulled on her and husband Dax Shepard. They once used an entire roll of tape to adhere gum — unchewed gum, for whatever reason — to their mom's chair before she sat on it. And just last week, they tricked Kristen into thinking they wanted to cuddle in her bed, but when she pulled back the comforter, her mattress was "saturated" with "easily a gallon of water." Yikes! That wasn't even the worst part, though, as they tucked some, er, interesting items into the sheets, too. Watch the video above and fast forward to around the 3:40 mark to hear the icing on the cake of their latest prank.