Jokes on you, Jimmy Kimmel!
The Precious star showed up to the ceremony in a white wedding dress and matching veil while holding a green umbrella to shield her face from the sun.
She even enlisted a friend to hold the train of her gown as she exited her black Escalade, stealing the bride's spotlight in jest.
Sidibe later slipped into a simple red dress and white ballet flats, letting McNearney have her moment on the couple's big day.
Per People, the couple requested guests make a charitable donation in lieu of bringing wedding gifts.
Prior the "I do's," the lovebirds were spotted kicking off the celebration at their wedding rehearsal reception Friday at the Ojai Valley Inn & Spa, where they were snapped all smiles sipping drinks with their pals in their chic white ensembles.
Kimmel popped the question to his gorgeous gal in August 2012 while the twosome were vacationing at Kruger National Forest in South Africa.
The 45-year-old TV personality and McNearney, who is one of the head writers on Jimmy Kimmel Live!, began dating in 2009.
The summer nuptials mark Kimmel's second trip down the aisle. He was previously married to Gina Kimmel, with whom he has two children, from 1988 to 2003.
In November 2012, the late-night host revealed he was leaving the wedding prep up to his ladylove, allowing McNearney to take the lead on the arrangements for the duo's special day.
"I'm not that involved with the wedding planning, but I will be there," he told Us Weekly. "It'll be mostly a family affair and there will be a Catholic priest officiating."
No doubt, Sibide's stunt was unexpected! But we're sure the comedian and his blushing bride were both great sports.