George & Stacy: Baby On The Way?

Forget the ring! George Clooney is making an even bigger commitment to Stacy Keibler — she's having a baby!

Stacy, who usually flaunts a fat-free frame, debuted a suspicious-looking bump June 16 while on vacation with george at Lake Como in Italy, where he has a palatial waterfront mansion.

"People were buzzing that she was pregnant," the source exclaimed. "There was definitely a bump, and she just seemed so peaceful and calm. All her friends are really excited for her!"

Stacy, 32, seems to have done the impossible and tamed Hollywood's most notorious bachelor — thanks to a little reverse psychology.

"George is so used to his women begging him to marry them!" the source said. "But Stacy said she didn't need a ring. George was so happy that he agreed to what she really wanted: a baby!"

Pick up this week's Star on newsstands for more details!