Where does the time go?!

Brooke Mueller has joined Instagram — and in her first posts to the social media site, she's shared two pics of her and ex-hubby Charlie Sheen's adorable six-year-old twins, Max and Bob.

The cute pair, who are the youngest of the 49-year-old actor's five children, were all smiles as they played on the beach in the Hamptons with their mom — what a photo op!

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Max getting in on some Hamptons beach action too!

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More Hamptons fun with Bob on the beach!

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It's nice to see the 37-year-old looking so happy, as it was only just a few years ago when she and Charlie were in a vicious custody battle.

Back in May 2013, Charlie's other ex-wife, Denise Richards, with whom he has two daughters, was awarded temporary custody of the boys after they were removed from Brooke's home over concerns of drug use. (Brooke was placed on involuntary psychiatric hold at UCLA that same month, and was later treated at The Betty Ford Clinic for drug addiction.)

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Brooke, Charlie, Max, and Bob in 2011.

TMZ reported this past December that Brooke and Charlie have finally settled their custody battle and have agreed to monitored visitations. She now has full custody of their kids.