The actor has landed a role as a recurring guest star in the show, E! Online reports.
His character Nick is described as a "scruffy-handsome" graduate student with an interest in photography.
Nick, who works for National Geographic, is also said to be charming and a traveller. He ends up falling for one of the female characters, but she is already in a relationship.
Wing recently appeared in ABC's The Whole Truth, which was dropped in December.
He also starred in Beautiful People and has had guest roles in shows such as Melrose Place, NCIS: Los Angeles and Drop Dead Diva.
Brandy, Sarah Hagan, Matt Cohen, Justin Deeley, Megalyn Echikunwoke and Kristina Apgar have already signed up to appear in the new season of 90210.
The show, which has been handed two extra episodes, will premiere on September 13 on The CW.
Watch a clip from the 90210 third season finale below: