It's official: Katherine Heigl is a married woman!

The Grey's Anatomy and Knocked Up star, 29, wed musician Josh Kelley, 27, in a black-tie ceremony Sunday at the Stein Eriksen Lodge in Deer Valley, Utah.

Afterward, her Grey's Anatomy co-star T.R. Knight, who was to have served as a "bridesman," told Us Weekly: "It was incredible. It was beautiful."

Despite the pre-wedding jitters Heigl admitted to having, it appears the day went off without a hitch, Katherine's sister Meg said simply: "It was great."

The 30-minute sunset ceremony, which ended shortly after 5 p.m., took place under a giant white tent in front of more than 100 guests, including Grey's  Anatomy co-stars Sandra Oh, Kate Walsh and Knight.

Katherine Heigl and Josh Kelley are officially married!

A heated wedding tent, dramatically lit by blue-and-purple lighting and decorated in large white drapes, was filled with silver chairs covered with white cushions on a white carpet. The couple wed on an altar flanked by brass candleholders.

The two met in 2005 when Heigl appeared in the music video for Josh Kelley's song "Only You." She gushed: "I met a guy I can't imagine living without!"

Josh Kelley popped the question on June 19, 2006, presenting the blonde beauty with a 3-carat, pear-shaped diamond flanked by pave diamonds - and half of the platinum band made from her mother, Nancy Heigl's, own engagement ring.