Jon Gosselin's estrangement from most of his children isn't stopping him from wishing his oldest twin daughters a happy birthday on social media.

On Monday October 8, the former Jon & Kate Plus 8 star took to Instagram to send his daughters Mady and Cara, who he shares with with ex-wife Kate Gosselin, birthday wishes.

"Happy 18th Birthday!!! To my twin girls, Mady & Cara!!! Love, Dad," Jon wrote.

As Breaking Celebrity News readers know, Jon has been estranged from his daughters since 2013 following a contentious divorce from Kate.