(Cover) - EN Showbiz - Ryan Reynolds is reportedly telling friends that he "can't imagine life" without Blake Lively.

The Hollywood pair have tried to keep their new romance low-key, but recent reports have suggested the budding relationship is moving fast.

Blake and Ryan have been friends since working on blockbuster Green Lantern last year, and sources close to the stars say they are quickly becoming infatuated with each other.

"They seem really happy together," an insider told more! magazine.

"Things are moving fast and I think he's already telling friends how he can't imagine life without her. She makes him smile and is down to earth. I'm sure the next step must be to move in together."

Just a few weeks ago Blake was in a relationship with Leonardo DiCaprio and Ryan was reportedly dating Sandra Bullock.

Ryan enjoyed a birthday dinner recently with both Blake and Sandra in attendance. An insider said the two got along swimmingly.

"Blake won Sandra over when she raved about New Orleans, where she spent the summer filming with Ryan last year. Sandra owns a house there because her adopted son is from the city," the source revealed.

"Sandra is thought to have told Ryan not to let her go!" (C) Cover Media