(Cover) - EN Showbiz - Leonardo DiCaprio is apparently ready to get married.

The 37-year-old Titanic actor and Gossip Girl star Blake Lively have been enjoying a whirlwind romance since getting together this summer.

But a source has told Star magazine that Leonardo is ready to take their relationship to the next level and is set to propose.

"His friends never thought he'd settle down, but he thinks Blake's The One," an insider claimed.

Leonardo is said to be captivated by the 24-year-old's all-American good looks and acting talent and is not put off by their 13-year age difference.

"He is planning to propose in the next few months," the source maintains.

"And he wants to get married and start on a family soon after that. He's finally ready to take himself off the market."

Leonardo had an on-again, off-again relationship with Brazilian model Gisele Bndchen until they finally split in 2005.

He also had a long term romance with Israeli model Bar Refaeli for around six years but they called it quits earlier this year.

Blake has dated actors Kelly Blatz and Penn Badgley. (C) Cover Media