AceShowbiz -

Lil Wayne claims in his new book proposal that Drake slept with his girlfriend. In a portion of his book proposal obtained by TMZ, Lil says the incident happened when he was serving his 8-month jail sentence in 2010.

According to the founder of Young Money Entertainment, Drake visited Lil in jail and confessed that he had sex with Lil's girlfriend in the previous day. "Yeah, it's true. Don't f**k with her like that cause I did f**k her," Drake told Lil, who admits that he had fought a lot with his girlfriend.

Lil writes, "This is the type of s**t that a man never wants to find out when he's locked up. Or, maybe so, cause only God knows what I would have done if I wasn't locked up right now. I woke up feeling f***ng up about the f***ng up day that I had ... finding out that she f***ng Drake was the absolute worst thing I could've ever found out. As a man, honestly, that s**t hurt ... and not because it was Drake, it could have been any man. It would've hurt the same."

Lil says after knowing the truth he was depressed and he didn't come out of his cell for several days.

Neither Lil nor Drake's representative has commented on the report yet.