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Leave it to Ryan Seacrest to put a twist on his sister's wedding.

The mega-producer, who recently ended his 15-season run hosting "American Idol," stepped up over the weekend to help with little sis Meredith's big wedding bash — as the Man of Honor!

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It was a title he took seriously, posting pictures throughout the day that showed how he helped Meredith with her special day.

The pair started out by picking up the Vera Wang dress on Thursday:

Then Saturday morning they took a trip to the gym:

And then finally on to the small ceremony, held in Mexico with close friends and family, as People magazine reported.

But this kind of wedding-day cooperation shouldn't come as a huge surprise, as the siblings already work together well: Meredith is the executive director and COO at the Ryan Seacrest Foundation.

She married Jimmy Leach, a senior executive at TOMS (you know, the company that made its name by giving away a pair of shoes for every pair it sold).

A fair amount of the wedding day fashion stayed all in the family: the groomsmen wore Ryan Seacrest Distinction collection suits and accessories, while naturally TOMS supplied the footwear.

RELATED: 'American Idol' ends, Ryan Seacrest looks to the future with his No. 1 lady

Last October, Ryan posted an Instagram of a poem his sister sent asking him to take on the role, and it's super-sweet:

If only all brother-sister relationships could be this lovely!

Congratulations to the bride and groom — and Ryan Seacrest, for proving he's master of all kinds of ceremonies!

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