The singer who has previously appeared on the small screen in Roswell and One Life to Live, will be performing in the episode which will air in November, eonline reports.
According to PerezHilton.com, Carmen Electra is also in line to star on the show on its 100th episode, and will be playing a character called Vesta, who is a cross between Dita Von Teese and a Pussycat Doll.
The former Baywatch actress is one of the latest in a number of high-profile stars to appear in past installments of the series, including Billy Ray Cyrus and Kellie Pickler.
Other stars to appear in show
Other musicians to have appeared in the show include Snoop Dogg, DJ Samantha Ronson - who is best known for dating Lindsay Lohan - and Christina Aguilera.
Carly Rae Jepsen will be appearing in the first episode for season five of 90210 which also stars Jessica Lowndes, Anna Lynne McCord and Michael Steger and is set to start off in the US on 8 October.
When asked about the decision to have Carly involved, executive producers Patti Carr and Lara Olsen said: "We think she's an exciting artist and we are thrilled to be able to have her music on the show again, this time in a live performance in our season premiere."
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