Jon Gosselin Wishes Twins Mady and Cara a Happy 15th Birthday With Throwback Pic

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Jon Gosselin's twin daughters Mady and Cara turned 15 on Thursday, and the former reality star took to Twitter to wish them a happy birthday with an adorable throwback pic.

"Happy 15th Birthday to my daughters Mady & Cara!" Jon captioned the sweet family photo. "Love you!"

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Jon, 38, and his ex-wife Kate Gosselin, 40, divorced in 2009 after being married for over a decade. The couple and their eight children – Mady and Cara plus a set of sextuplets -- were the subject of the popular TLC reality series Jon and Kate Plus 8.

After the couple's tumultuous divorce, Jon left the series and the show became simply Kate Plus 8. According to both Jon and Kate, their relationship after the split has been nearly non-existent.

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"I don't have a relationship with Kate. There is no relationship. Text and email. That's it," Jon told ET during an interview in 2013. "The nanny comes out and I exchange the kids at her gate or at the bus stop. I don't physically see her."

For more on Jon's life after the divorce and losing his reality series, check out the video below.