Daniel Radcliffe and his girlfriend of nearly two years, Erin Darke, have "great chemistry," an insider tells Us Weekly Credit: Dimitrios Kambouris/Getty Images for Tony Awards Productions

It's getting serious! Daniel Radcliffe and his girlfriend Erin Darke only have eyes for each other. The Harry Potter alum and the actress finally made their red carpet debut at the Tony Awards earlier this month, and are "very happy" together, an insider tells Us Weekly.

Radcliffe, 24, and Darke, 29, first met while filming Kill Your Darlings in 2012. Despite keeping their romance undercover for two years, the twosome got affectionate while attending an afterparty at Skylark club following the Tonys in NYC on June 9. 

They were "inseparable" an eyewitness told Us. "They have great chemistry."

The British star first admitted he was taken during an appearance on Bravo's Watch What Happens Live in October 2013. When asked by a caller if he had someone special in his life, he replied: "Yes, I am dating someone. And my type is…the type I keep private." He added: "My type is intelligent."

Radcliffe has a knack for finding love on set. He previously dated another actress, Laura O'Toole, his costar in Broadway's Equus in 2009, and was once rumored to be dating Olive Uniacke, the stepdaughter of a Harry Potter producer. In October 2012, he split from production assistant girlfriend Rosie Coker. The pair first met on set of Harry Potter and the Half-Blood Prince in 2007 and shared a $4.3 million apartment in NYC.