Lily Collins' Boyfriend Jamie Campbell Bower and Ex Chord Overstreet Both at Her Toronto Premiere

Find out what went down at the screening of the actress' new drama Writers

Lily Collins may have told us that her mom was her date the other night at the Toronto Film Festival, but we know better.

At first we had thought maybe she and her ex, Chord Overstreet, were reuniting because we saw the Glee star slip into the Ryerson Theatre for the premiere of Collins' new drama, Writers. He was actually one of the first to arrive even before the red carpet was opened with his hottie pal Glen Powell, who is also in the movie.

But when Collins arrived, we heard fans screaming, "Jamie!"

As in Jamie Campbell Bower.

Collins' real-life boyfriend and costar in The Mortal Instruments: City Of Bones, which is currently filming in Toronto, tried to stay under the radar wearing a hat and sunglasses and hiding behind the step-and-repeat. The throngs of fans immediately recognized him.

A source confirms that Collins and Bower, who are both 23, have been dating since they were first spotted getting cozy offset in July about a month after Bower and fellow Harry Potter star Bonnie Wright called off their engagement.

No word on what Bower (also known for his work in Twilight as vampire Caius) thought of his girlfriend's work playing Samantha, a "sexually aggressive" teenage daughter of divorced parents, in Writers.

"Samantha's a very black and white type of girl and she says either you're a hopeless romantic or you're a realist," Collins explained. "You either get laid or you don't."

Also at the premiere were the film's Greg Kinnear, Logan Lerman, Nat Wolff and Liana Liberato as well as their director Josh Boone and Collins and Bower's Mortal costar Kevin Zegers.