Celebrating the birth of fashion designer Johnny Wujek, Katy Perry and Amber Heard were spotted skating the night away at MoonLight Rollerway Los Angeles, CA on Monday night (July 16).

The sexy stars were joined by adorable couple Rachel Bilson and Hayden Christensen for a 1990s themed birthday bash at the trendy hotspot.

The "Wide Awake" songstress was decked out in her retro attire with Beanie Babies in hand as she tweeted a photo of herself on the rink with the caption, "Babysitters club BFF circa 1994 RT @shannonwoodward: Couples skate!"

In regards to Miss Perry, it looks like she's enjoying her newly found freedom as it was previously report ed by GossipCenter that her divorce from ex-husband Russel Brand became official today.

In a recent interview with MTV, the brunette beauty spoke out about the divorce saying, "It's not about the problem; it's about how you solve it. And if I can be an example showing people that they don't have to lay down and die because they've been thrown a curveball, then that's great."

Enjoy the pictures of Katy Perry, Amber Heard, Rachel Bilson and Hayden Christensen at Johnny Wujek's Rollerskating Birthday Party at MoonLight Rollerway Los Angeles, CA (July 16).