Kaley, who plays Penny in the US sitcom, walked down the aisle on New Year's Eve looking very glamorous in a pink dress designed by Vera Wang.
She gave fans a glimpse of the gown via a photo posted to Instagram following the ceremony, showing herself and new husband Ryan sharing a kiss. The caption read: "Yep :) #thesweetings @ryansweething."
According to Us Weekly, they tied the knot at around 10pm at the Hummingbird Nest Ranch in Southern California, surrounded by friends and family.
Kaley and Ryan's nuptials came following a whirlwind romance.
They surprised many when they announced their engagement in September, just three months after they began dating.
But Kaley defended their decision shortly afterwards, telling ET Online that while she understands why eyebrows were raised, it felt right for them.
"From day one I just knew immediately and it's been magic. We have all the same family friends," she explained. "We grew up with the same people, we just never met. So I kind of feel that I've known him my whole life. I know that it seems a little crazy on paper, but it's what works for us."
Just a few days before the wedding, the happy couple marked their first Christmas together, uploading photos of their festivities to Instagram. One photo showed them toasting the day together alongside the caption: "1st Christmas together! Killed it! @ryansweething."
They were introduced by a mutual friend who encouraged Kaley to agree to a blind date with Ryan while he was visiting LA from Florida. Kaley later admitted she was reluctant to go but agreed... and look how it has turned out!
Congrats to Kaley and Ryan!