PICTURE: Cat Deeley Shows Off Ring at First Post-Wedding Event

Kat Deeley attends a private screening of Matthew Williamson XV hosted by Nadja Swarovski at Nobu Berkeley on October 24, 2012 in London, England. Credit: Nick Harvey/WireImage.com

Three weeks after her wedding, Cat Deeley is still every bit the blushing bride.

The So You Think You Can Dance host, 35, stepped out in London Wednesday, her first official public appearance since tying the knot in late September with Irish comedian Patrick Kielty.

Deeley glowed in a floral print, 3/4 sleeve shift dress, which she accessorized with black tights, high heeled boots -- and her new wedding bling.

"It was the most beautiful, gorgeous, chic and romantic wedding I've ever been to," one source told Us Weekly after Deeley's nuptials, which took place at St. Isidore's College Church in Rome, Italy.

The British beauty wore a "gorgeous" dress with "ruffles all the way down," the insider says, and pinned her hair back. "She looked like a goddess!"

Deeley and Kielty first struck up a friendship in 2002 while filming a reality show called Fame Academy. They began dating around Christmas of last year.