J. Edgar screenwriter Dustin Lance Black has promised a “tender” kiss for co-stars Leonardo DiCaprio and Armie Hammer.

DiCaprio will play the role of FBI director J. Edgar Hoover, while Hammer, the 24-year-old co-star of The Social Network, will play Clyde Tolson, Hoover's alleged lover and co-worker, in the highly-anticipated Clint Eastwood-directed biopic.

Black, whose credits include Milk, told E! Online that the co-stars will definitely kiss.

“Yes, certainly there's a relationship between these two guys,” Black told the entertainment website. “And it wouldn't be a Dustin Lance Black script if it didn't have a little gay kissing in it. So the answer is yes.”

“Those who want to see that will be pleased. I think it's done in a very tender way, surprisingly,” he added.

Earlier, Hammer told reporters that he's ready for a “ton of kissing scenes” with DiCaprio.

The film also stars Denis O'Hare (True Blood), Josh Lucas (Glory Road), Ed Westwick (Gossip Girl), Naomi Watts (King Kong) and Judi Dench (Casino Royale). Filming began last month in Los Angeles.