Kaley Cuoco of 'Big Bang Theory' Engaged to Ryan Sweeting After Three Weeks of Dating

Just after three months of dating  actress Kaley Cuoco and boyfriend Ryan Sweeting, have announced their engagement!

Kaley's rep confirmed the news to Us Weekly. "It's only been three months but she knows Ryan is the one," a source close to the actress explains. "When you know, you know," a source close to 'The Big Bang Theory' actress revealed.

It is reported that Ryan, tennis star, proposed to Kaley on September 25 just three days after the couple were seen together at the Emmy Awards. No wonder Kaley's tweet where she expressed her joy. "Flying high, I could literally touch the sky with you . . ."

Later she also posted a photo saying, "I love u @ryansweething :)."

"(She's) never felt this way. She knows this is it. And the ring is gorgeous!" a friend told UsWeekly.

News of her engagement did rounds after she stepped out wearing a lovely ring. The couple seem to madly in love. After their appearance on Emmy Awards, Ryan posted their photos. "A million people, all I see is her @normancook #emmys." Posting another photo, he wrote, "Am I not the luckiest?? @normancook #dontwakemeup."

 Kaley previously had a secret affair with her 'The Big Bang Theory' co-star Johnny Galecki for two years. The two broke up later. In 2011, Kaley announced that she was engaged to an addiction specialist Josh Resnik. But in March 2012 she revealed that they were no longer together. She also dated the Superman handsome hunk Henry Cavill for two weeks in July.