Heidi and husband Spencer Pratt were among the friends and family who watched Jen tie the knot with fiancé Tayor Dunphy on 10 August.
"Best wedding ever!" gushed Heidi. "Congrats! You look stunning! Love you!"
She also shared a collage of pictures of herself and Spencer playing around in a photobooth at the wedding ceremony.
Jen and Taylor became engaged last summer, with Jen saying at the time: "Just got engaged to the most amazing man in the world!"
She also shared a picture of her GORGEOUS engagement ring. Lucky, lucky girl!
So far we haven't seen any photos of Jen's wedding dress - which was flown all the way over to the US from Italy - but we reckon she looked amazing!
Next stop for the newlyweds is an exotic honeymoon to Indonesia.
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Stars who married in 2014 in pictures:
Copyright: WENN Twitter @realbkbrown / Instagram @norman cook / E! Instagram @kimkardashian / Rex Features