Kaley Cuoco can't stop staring at her engagement ring.

The 'Big Bang Theory' star - who recently got engaged to her boyfriend Ryan Sweeting after just three months of dating - is ''beyond happy'', according to her best friend Ali Fedotowsky.

Asked about the sparkler, the blonde beauty, 29, told MTV.com: ''It is so gorgeous! I said to her, 'Kaley, you must not be able to keep your eyes off of it,' and she's like, 'I know, I can't. I keep staring at my hand.' It's exactly what she would have picked for herself and she loves it.''

Kaley, 27, recently revealed that she was shocked when professional tennis star Ryan, 26, proposed shortly after he picked a fight with her and Ali thinks their engagement story is very ''endearing.''

She said: ''Hearing Kaley and Ryan tell the story - it's so endearing. He did pick a fight because they were on the set of her new movie 'The Wedding Ringer' and he needed to leave but he needed an excuse and he didn't know what to do, so he picked a fight to go home and prepare to propose.

''She didn't know that at first, but when she got home, she was so floored and beyond happy.''