Another photo of Collins, also shared on Instagram shows her with a stunning smile, clearly overjoyed on her big day. Collins captioned the sweet image: "Never been happier… (sic)"
In a separate photo, Collins described their romance as a fairytale that's been turned into her "forever reality".
Collins, who is the daughter of music star Phil Collins, wrote in a caption: "What started as a fairytale, is now my forever reality. I'll never be able to properly describe how otherworldly this past weekend was, but magical is a pretty good place to start… (sic)"
McDowell - who got engaged to the actress in September last year - has also posted the same images on his own Instagram account.
The director wrote: "I married the most generous, thoughtful, and beautiful person I've ever known. I love you @lilyjcollins (sic)"
In another snap, shared by McDowell, the loved-up couple are seen sharing a kiss by a waterfall. The director, who is best known for 2014 comedy movie The One I
Love wrote: "This moment will forever play inside my head."
The newlyweds announced their engagement last September in Sedona, Arizona, with Collins showing off her ring on social media. They became engaged after just one year of dating.