Adrianna going into labor at the West Beverly prom will clearly be the most exciting thing to happen on tomorrow night's 90210.

Still, it should also be cool to watch real-life electro-pop duo The Veronicas making a cameo on the episode. The pair will perform its hits “Untouched” and “Take Me On the Floor.

Twins Jessica and Lisa Origliasso told People they shot the episode on the Queen Mary boat in Long Beach, California.

“We had a great time,” said Jessica, specifically referring to one cast member that was extra nice to her and her sister. "[Shenae Grimes] hung out with us a bit and was so nice and she’s a fan of ours.”

Veteran fans of Beverly Hills, 90210, the twins were a bit disappointed when they didn’t get to meet any of the returning cast members.

“We were only on set for about 3 hours,” said Jessica. “I wish we’d had the chance to meet Shannen Doherty. I love her!”

90210 spoiler alert for The Veronicas and others: Doherty will appear on the season finale next week!

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.