This is interesting. I found it on Wikipedia concerning Austin Nichols:
"Nichols has been friends with fellow actor Jake Gyllenhaal since the two met on the set of The Day After Tomorrow in 2004. Nichols said in one interview, "I've learned a ton from Jake. He's a really sharp guy. He told me everything about acting, the business, girls, life."[2] After the film was made, there were some rumors that the two were a couple, which Nichols dismissed as "all new to me" and "ridiculous".