LOS ANGELES: Ryan Sweeting, 26, has proposed to The Big Bang Theory actress Kaley Cuoco, 27, after three months of dating, her rep confirms to UsWeekly. 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.’ Ryan popped the question on Wednesday just three days after he stepped on the red carpet with his sweetie during the Emmy Awards in LA. She soon after tweeted: ‘Flying high, I could literally touch the sky with you . . . ‘ –MO