Charli XCX is one badass woman, so you would think she'd plan to party hard and "Break The Rules" on the night she released her debut album, Sucker.

But actually, she says she had some "PG wholesome fun" with none other than Nick Jonas.

"I was kind of celebrating my album release [Monday, December 15] in a way I never thought I would be. I was actually with Nick Jonas and his girlfriend [Olivia Culpo], who is Miss Universe, iceskating in Boston," she said during "Live From MTV" tonight.

"Then we had loads. We ordered 12 or 15 pizzas afterwards, and that was it. It was, like, bizarre, very PG, wholesome fun. I think they hired out a rink, and they were like, 'You want to come?' I was like, 'Yeah, I love iceskating.'"

So, is Charli a skilled ice skater? "I did not fall once," she said. "I was wearing a cheerleader skirt and I had to be on TV the next day, so I was definitely living on the edge."

And she was also living on the edge when she had a "serious dance-off" with Haim at Taylor Swift's 25th birthday party, where she partied alongside Beyoncé, Jay Z and Justin Timberlake.

"Yeah, it was pretty weird, but it was such a fun night -- but good fun, wholehearted fun," Charli said of hanging out alongside the A-list guests. "Me and the Haim girls had a serious dance-off. It was good. I had a great time."