Victoria Justice may be Hollywood hot stuff … but her little sis Madison Grace is giving her some serious competition — and we’re celebrating the bikini babe’s 30th birthday in style!

Madison’s clearly living that easy-breezy beach life … flooding her socials with snaps of herself soaking up the sun and showing off the goods.

Sure, Victoria’s the TV superstar of the family — but Madison’s carved out her own lane as an influencer … and when these two genetically blessed sisters link up, it’s basically a hotness overload.

Need a breather from all the smoke? Go ahead and check out the Madison-themed game above.