Well ... they finally did it ... after months and months of talking about it, Avril Lavigne and Deryck Whibley tied the knot in Montecito, CA yesterday afternoon:

Avril Lavigne wed Sum 41 frontman Deryck Whibley on Saturday afternoon at a private estate in Montecito, Calif., a source confirms to PEOPLE. At the outdoor, non-denominational ceremony, Lavigne was walked down the aisle by her father, John, to Mendelssohn's "Wedding March." She wore a Vera Wang gown and carried a bouquet of white roses. The couple said their vows under an awning decorated with white flowers in front of 110 guests, including family and friends from their native Ontario. Once the groom had kissed the bride, guests tossed rose petals at the newlyweds as they walked back up the aisle. After the wedding, guests were to be treated to an outdoor cocktail hour before the reception, including a sit-down dinner, under a tent on the estate. In contrast to the all-white ceremony, the reception will have a red theme, with centerpieces of red roses and other flowers. The couple's first dance is expected to be to the Goo Goo Dolls' "Iris." LOL! The Goo Goo Dolls? Well, it's somehow appropriate, don'tcha think? Deryck is 26 but Avril is only 21 -- strikes me as kinda young to be getting married but they've been a pretty rock solid couple ever since they hooked up a couple of years ago. I ain't gonna hate at all ... congrats to the happy couple! I wonder how long will we see a little punkyesque baby?