Len Goodman from Dancing with the Stars. Credit: Adam Taylor/ABC via Getty Images

Len Goodman is going into 2013 a newlywed!

The 68-year-old judge on ABC's Dancing With the Stars married his longtime girlfriend, dance teacher Sue Barrett, Sunday in London, an ABC rep for Goodman tells Us Weekly.

Goodman and his girlfriend of 10 years, 47, invited just 30 friends and family members to the ceremony, which was disguised as an intimate lunch. Both dressed in blue, the couple were married by Westminster superintendent registrar Alison Cathcart, according to The Daily Mail. After they swapped vows, the newlyweds and their guests enjoyed a five-course meal and champagne reception.

"I've had a marvelous day, and now my gorgeous Sue is the new Mrs. Goodman," the reality show judge told The Daily Mail. Though he kept his nuptial plans largely under wraps, Goodman said he did let one important person in on the secret: His mother. "I wanted it to be a low-key affair, so we didn't tell anyone except my 96-year-old mum as I didn't want her having a heart attack with the surprise."

Barrett is Goodman's third wife. He married his dancing partner Cherry Kingston in 1972, and has a son, James William, with his second wife Lesley.

Beams Goodman of Barrett: "She's gorgeous and makes me very happy -- though she likes to stay out of the limelight. It was a complete surprise to my friends and family today and we've had a fabulous time."