Kaley Cuoco and Ryan Sweeting are reportedly engaged.

The 'Big Bang Theory' star - who started dating the tennis player three months ago - accepted her now-fiance's proposal yesterday (25.09.13).

According to UsMagazine.com, representatives for Kaley - who plays Penny in the sitcom - have confirmed the engagement.

Meanwhile, an insider has claimed while it might be a whirlwind romance, the 27-year-old actress is certain Ryan is ''the one''.

The source said: ''It's only been three months but she knows Ryan is the one. When you know, you know.''

While an official announcement is yet to be made, Kaley hinted at the news yesterday when she tweeted saying she was ''flying high'' in a post seemingly referring to her new fiance.

She wrote: ''''Flying high, I could literally touch the sky with you.''

The couple only made their red carpet debut together at a pre-Emmy Awards party last weekend, and they were first seen before that at a horse ranch in California last month.

Neither of the couple have been married before, although Kaley - who also dated her 'The Big Bang Theory' co-star Johnny Galecki - recently split from 'Man of Steel' actor Henry Cavill.

Speaking about their break-up, a source previously said: ''She just got overwhelmed with the very public Superman relationship.

''She's not used to that much attention and chaos in her life.''