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Oh, and their mum - played by Bonnie Hunt - was chucked into the mix for good measure.
It was shared by Piper Perabo, who played Martin's eldest daughter Nora, on Wednesday. She wrote: "Surprise! From the Baker family to yours. We are all in this together."
Guessing that's a reference to the coronavirus pandemic, then.
Of course it is! What else would literally anything be about right now?
Anyway, the reason the kids got together again was in support of US charity No Kid Hungry to raise some much-needed funds to feed children throughout this dreadful crisis.
Cheaper by the Dozen, a remake of a film made back in the 1950s, first hit screens around the world in 2003, and tells the story of a huge family all living under the same roof.
It starred Martin and Hunt as the parents of 12 kids, and featured turns from Ashton Kutcher - who played Nora's boyfriend - and Succession star Alan Ruck as the Baker family's neighbour.
Wonder whatever happened to them, eh?
There was a sequel in 2005, as well. It seems that families enjoyed the antics of the Baker family, led by comic acting legend Martin.
That sequel starred Eugene Levy - who you'll recognise as the dad from American Pie - as the head of another rival family.
Of course, Hilary Duff is probably the most recognisable of all the children who were in the film, and this isn't her only reunion of late.
Back on May 11, Duff gathered the cast of Lizzie McGuire to do a table read of a famous episode for fans of the show.
Obviously, like all get-togethers at the moment, it wasn't physically possible. But, if you can't have a family Zoom quiz, why not read an episode of a kids TV show?
Duff wrote: "We could not stop laughing reading lines from tween us... this is the first time we were all 'together-ish' in almost 18 years!"
Well, at least they've all had a bit of fun along the way. That's the most important thing, after all.
Oh, and raising money so that kids can eat. Actually that's the most important thing.
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