“Big Bang Theory” actress Kaley Cuoco is reportedly engaged to professional tennis player Ryan Sweeting after just three months of dating.

A source close to Cuoco revealed on Thursday that Sweeting proposed to the 27-year-old actress shortly after last Sunday’s Emmy Awards, Us Weekly reports. "It's only been three months but she knows Ryan is the one,” a source close to Cuoco told Us Weekly. “When you know, you know.”

Sweeting, a 26-year-old tennis player from the Bahamas, proposed to Cuoco on Wednesday, Sept. 26, Us Weekly reports. The couple became engaged just days after making their red carpet debut at an event for the 2013 Emmy Awards.

While Cuoco has yet to directly address the apparent engagement, she was in a celebratory mood in a Wednesday Twitter post. “Flying high, I could literally touch the sky with you…” Cuoco tweeted. The “Big Bang Theory” actress also hinted at the big news on her Instagram account, posing for a picture with her mother and sister. “A sweet celebration w my sweet soul sisters,” Cuoco captioned the photo.

Us Weekly suggests that another of Cuoco’s recent Instagram posts supports the rumors that she and Sweeting are now engaged. On Wednesday, Cuoco posted a photo of two penguins holding hands, along with the caption, “I love u [Ryan Sweeting].”

Cuoco was also spotted wearing a massive diamond engagement ring on the Los Angeles set of her upcoming film “The Wedding Ringer,” E! Online reports. However, the movie is wedding-themed, so the engagement ring may have been a prop.

If Cuoco and Sweeting are actually engaged, it will be the first marriage for each of them, Us Weekly notes. The couple has reportedly dated since August, when they were spotted together at a Moorpark, Calif., horse ranch.

“[She’s] never felt this way,” Us Weekly’s source said of Cuoco. “She knows this is it. And the ring is gorgeous!”