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Married to Jonas, Twit Pic

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Can you guess who's turning the big 1-2?

That's right—it's Frankie Jonas! Today is his official birthday, and while we're sure this Ponyo cutie is celebrating in Jonas style, he kicked the festivities off yesterday with big brother Kevin Jonas and sister-in-law Danielle Jonas.

"Happy birthday," Kevin posted along with a pic of his little bro about to blow out the candles on a serious looking sundae.

Married to Jonas, Twit Pic

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"I love you Frankie happy birthday," Dani Instagrammed to her fans.

Extra fun bonus? Frankie turned the picture table around and posted this super sweet shot of Kevin and Dani cozying up together.

Want more Jonas action? Make sure to tune into an all new episode of Married to Jonas on Sunday at 10/9c only on E!