Aaron Carter Wasn't at Brother Nick Carter's Wedding—Find Out Why!

Rep tells E! News, "Aaron was legitimately busting his ass to make it to his brother's wedding. He felt awful and had every intention of being there."

There was one very important person missing from Nick Carter's wedding.

Unfortunately, his younger brother Aaron Carter didn't make it to the gorgeous ceremony in Santa Barbara, Calif., over the weekend because of flight delays.

"Aaron had a contract to appear at the Cherry Blossom Festival in D.C. before Nick set his wedding date. Even though he was obligated to fulfill his contract, Aaron still wanted to make the wedding," the celeb's rep tells E! News.

"There was a team of six people who worked to put together a plan to get him to Santa Barbara by the reception so he could at least participate in the celebration. He was on his way when his US Airways plane experienced mechanical difficulties in Pittsburgh and they became grounded there. So he never made it. Aaron was legitimately busting his ass to make it to his brother's wedding. He felt awful and had every intention of being there."

Aaron also posted a photo of himself stuck on the plane on Instagram with the caption, "Really pissed off that I missed my brothers wedding today..  i hope he doesn't hate me .. I tried to get there... I'm sorry bro @nickcarter#technicalProblems."

The 34-year-old singer and his fiancée, fitness expert Lauren Kitt, tied the knot at the Bacara Resort and Spa in Santa Barbara on Saturday. The nuptials took place a little over a year after Carter popped the question on a small island in the Florida Keys.

The Backstreet Boys crooner tweeted, "Happiest day of my life 4-12-2014 I married my best friend and woman of my dreams. Lauren Kitt Carter honeymoon time!" He followed up with a photo alongside his new bride, each of them flipping the bird, with the caption, "To all the haters that thought it wouldn't last...I LOVE Mrs Carter! @laurenkitt #ilovemywife#ilovebeinghusband"