'He's the one': Kaley Cuoco confirms she is engaged to tennis star Ryan Sweeting after just three months of dating

Ryan Sweeting, 26, has proposed to The Big Bang Theory actress Kaley Cuoco, 27, after three months of dating, her rep confirms to UsWeekly.

On Tuesday the actress flashed a massive diamond sparkler while on the Los Angeles set of her film The Wedding Ringer.

'It's only been three months but she knows Ryan is the one,' a source tells the magazine. 'When you know, you know.'