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Kaley Cuoco is engaged!

Kaley Cuoco is getting ready to tie the knot with her boyfriend Ryan Sweeting!

A representative for the Big Bang star confirmed the news to Us Magazine on Thursday.

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A source close to the actress told the magazine: "It's only been three months but she knows Ryan is the one.

"When you know, you know."

Sweeting, a professional tennis player, proposed to the 27-year-old actress on Wednesday, just days after they made their red carpet debut at the Emmy award ceremony.

Kaley Cuoco spotted with her engagement ring on September 25th! Source: Getty

Following the proposal, Cuoco tweeted her excitement, saying:

"Flying high, I could literally touch the sky with you..."

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The bride-to-be sparked engagement rumours earlier this week when she was spotted on a film set in Los Angeles showing off the large diamond ring.

A second source added: "[She's] never felt this way.

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"She knows this is it. And the ring is gorgeous!"

Sweeting, 26, and Cuoco were seen together at a horse ranch in California in early August.