According to ew.com, Riabko will play a love interest of one of the male characters on the show.
In addition to his Broadway credits, Riabko is a singer-songwriter who has put out an album, "Before I Speak," and toured with Jason Mraz, Maroon 5 and John Mayer. He has appeared in the TV film "Limelight" and the upcoming film "Rising Stars."
"90210" will make its season premiere Sept. 13. For more information visit www.CWTV.com.