The Big Bang Theory star, 27, is engaged to tennis star Ryan Sweeting after just three months of dating.

Kaley’s rep confirmed the news on Wednesday.

“It’s only been three months but she knows Ryan is the one,” a source said.

“When you know, you know.”

Sweeting, 26, proposed on Wednesday, Sept. 26 — just a few days after the couple made their red carpet debut together over the weekend at a pre-Emmys bash and then at the Emmy Awards show itself in L.A.

On Friday, Cuoco, 27, called Sweeting the “greatest date ever” on Instagram, sharing a cuddly photo of the pair.

“#emmyweekend greatest date ever @ryansweething,” she wrote.

Sweeting, 26, later shared a sweet snapshot on his Instagram account writing, “A million people, all I see is her @normancook #emmys”

Prior to dating Sweeting, Cuoco briefly dated Man of Steel actor Henry Cavill.

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