Surprise! Bridget Moynahan Marries Businessman Andrew Frankel – See Their Romantic Wedding Photo

It’s wedding bells for Blue Bloods star Bridget Moynahan.

The actress said “I do” to New York businessman Andrew Frankel on Saturday evening, during an intimate ceremony in the Hamptons, New York. “The couple was surrounded by friends and family,” a source tells PEOPLE exclusively.

The nuptials may be news to fans, as Moynahan has largely kept quiet about the relationship. “The groom is from New York and is Co-President of Stuart Frankel and Co., a Wall Street institutional brokerage firm,” explains the source. “They met each other through a friend and she has been on cloud nine ever since.”

“Oh, by the way, guess what I just did @johndolanphotog #sohappy #perfection #friends #family #forever,” Moynahan wrote on Instagram.

The couple is looking forward to blending their families. “Bridget’s son Jack [with ex Tom Brady] is excited to be gaining three incredible older brothers,” the source tells PEOPLE.

In lieu of gifts the couple asked guests to donate to The Hole in Wall Gang Camp, which serves youth with cancer and other serious blood diseases, and, says the source, “is an organization near and dear to the hearts of both the bride and groom.”

• With reporting by CHARLOTTE TRIGGS