West Side Story Veteran Grant Gustin Cast on Glee as Potential Love Interest for Darren Criss

Despite proclaiming his love for Kurt (Chris Colfer) on the second season finale of Glee, it appears that Blaine (Darren Criss) may develop a case of wandering eyes. West Side Story tour veteran Grant Gustin has been cast on the series as Sebastian, a Dalton Academy Warbler who sets his sight on dating Blaine, according to TVLine.com.

While FOX would not reveal details about the character, sources say that Gustin is the polar opposite of Kurt and has a scheming, promiscuous personality comparable to Santana. Seeds of discord were sown in the September 27 episode when Kurt seemed miffed at Blaine's star-quality audition for the forthcoming McKinley High production of West Side Story.

Gustin will make his Glee debut on the season's fifth episode.

Think Gustin will have the chops to lure Blaine away from Kurt? Check out a video of Gustin performing Brian Lowdermilk and Kait Kerrigan's "Run Away With Me" at an open mic night in Chicago this summer while on the West Side Story tour.