Everyone loves "Lady Marmalade." The 2001 version of the Kenny Nolan and Bob Crewe track—expertly covered by Christina Aguilera, Mya, Lil' Kim, and Pink—popped up on the Moulin Rouge! soundtrack and secured the top spot on the Billboard Hot 100 for weeks. Even 16 years later, the track still bangs.

Despite the track's good vibes, two of its performers weren't exactly on the best of terms behind the scenes. Pink and Christina Aguilera, infamously, had their share of well-publicized disagreements. On Thursday's Watch What Happens Live, Pink was asked during a round of "Plead the Fifth" about her and Aguilera recently making amends. Though all is well between the two now, Pink confirmed that tensions did indeed peak during an encounter at an unnamed club.

"We were super young and super new at the whole thing, and I think I'm an alpha and she's an alpha and I'm used to taking my altercations physical and she's used to having them verbal," Pink said. "We just are very different, and we were very young and new. Women have to learn how to support each other. It's not taught to us on the playground."

Asked if things ever got physical, Pink recalled an in-club encounter that now makes her laugh. "Actually, she swung on me in a club, which is hilarious," Pink said. "I was like, 'What's happening right now?'" As for their current relationship, the animosity is well behind them both. "We're fine," she said. "She's so talented. And deep down, I've had bad days too. She's really a sweet person. We made up on The Voice."

Catch Pink's full "Plead the Fifth" segment, during which she also calls Kanye West "a talented genius," in the video up top.