Wedding Disaster: Bristol Palin Ditches Sister Willow's Wedding After Massive Fight

Willow Palin was ditched by her own sister at the last minute on her wedding day after the two got into a massive fight, RadarOnline.com has exclusively learned.

Sources exclusively spilled to RadarOnline.com that Willow, 24, spent Saturday, September 29 saying "I do" to Ricky Bailey in Alaska, but her big sis Bristol wasn't there to witness it!

Drama before the wedding exploded on Friday, when Bristol, 27, blew up at the bride-to-be after she learned their bad-boy brother, Track, 29, was invited.

"Bristol started a huge fight with Willow because her kids aren't supposed to be around Track," a source close to the Palins told RadarOnline.com.

The source added that Bristol's ex-husband, Dakota Meyer, banned their children from speaking with Track months ago. As RadarOnline.com readers know, Track ultimately didn't make it to Willow's wedding because he was arrested for domestic violence the night before the wedding.

The source said Bristol was so angry about Track's invitation that her sister that she refused to stand by her side as her bridesmaid.

"Bristol was supposed to give a speech at the wedding," the source said. "Instead she packed up her kids and left, leaving Willow behind."

The Palins tried covering up the family drama after the ceremony. Mom Sarah Palin and daughter, Piper, called the wedding "perfect" on Instagram.

Meanwhile, Bristol acted as if the wedding did not even happen! On Sunday, the new Teen Mom OG cast member shared videos of her children running around a soccer field, shown above.

"My world," she captioned one photo of the little ones.

The wedding drama was "definitely" noticed by attendees, the source added.

"People feel bad for Willow because her siblings suck so much and she knows it," the source added.