Kate Gosselin celebrates her sextuplets' 20th birthday on Instagram with a rare look at four of her grown-up kids. The 'Jon & Kate Plus 8' star calls Alexis, Aaden, Joel and Leah her 'forever babies.' Kate shares the children with ex-husband Jon Gosselin, along with the two other sextuplets, Hannah and Collin. They're also parents to twin daughters, Mady and Cara.
