Credit: DanneelHarris/Twitter

Danneel Harris looked radiant during a rare red carpet appearance on Saturday, May 18. The One Tree Hill actress showed off her growing baby bump in a floor-length jersey dress at UCLA's Spring Sing event. It's the second time the star has stepped out publicly since announcing her pregnancy earlier this year.

Harris' husband, Supernatural's Jensen Ackles, served as a celebrity judge alongside Italian model Elisabeta Canalis and cosmetic dentist Dr. Bill Dorfman. During the show, students performed in front of nearly 7,000 UCLA classmates, alumni, faculty and staff. "Had so much fun tonight!" Harris tweeted. "What an incredible showcase of talent! Be proud UCLA!"

Harris, 34, and Ackles, 35, announced their baby news in January. "Thank you for all the well wishes," the mom-to-be tweeted. "We are very excited about our soon-to-be new addition." The couple later revealed they are expecting a little girl.

In lieu of gifts, the stars asked fans to donate to the charity Hats Off for Cancer. "We are truly grateful for your support and generosity," Ackles said. "You guys are the best!" To date, the parents-to-be have helped raise more than $34,000.

Harris and Ackles married in 2010 in the actor's hometown of Dallas, Texas. Supernatural will return for a ninth season Tuesdays this fall on The CW.