Ryan Sweeting engaged to Kaley Cuoco

Ryan Sweeting and Kaley Cuoco hit the red carpet before the Emmys. (Frazer Harrison/Getty Images)

When you know, you know. You know?

Just a few days after tennis pro Ryan Sweeting stepped out onto the Emmys red carpet with his girlfriend of three months, The Big Bang Theory's Kaley Cuoco, he dropped to one knee and popped the question. A rep for the actress has confirmed that the couple are engaged, reports US Weekly.

Sweeting, 26, a former U.S. Open junior champion who played for the University of Florida, reached a career high ranking of No. 64 after winning the U.S. Men's Clay Court Championships in Houston in 2011, his only ATP title. Now ranked No. 532, Sweeting has played just one ATP main-draw match this year, a first-round loss at the SAP Open, and has not competed at a tournament since Sony Open qualifying in March. He underwent back surgery last month.

Cuoco, 27, has ties to tennis. She was a regionally ranked junior in Southern California and is friends with Bob and Mike Bryan.

She also loves posting pictures on her Instagram account. Here are few of the engaged couple throughout their whirlwind courtship:

http://instagram.com/p/c3GTdjuWQs/

http://instagram.com/p/dGjz2xuWVE/

http://instagram.com/p/dVajpqOWR7/

http://instagram.com/p/dd2pHzuWXG/

http://instagram.com/p/dsYDx1uWZG/