Taylor Swift upstages bride at wedding

There's nothing quite like a megastar to totally upstage you at your wedding -- but Taylor Swift took it one step further by committing the ultimate wedding guest no-no.

After a weekend of fun at Coachella, the singer attended her backup singer Eliotte Nicole's wedding in Texas and donned a white dress!

We're sure the bride didn't mind much. After all, the "New Romantics" singer traveled from Coachella to San Antonio and back -- all in one day -- to catch the nuptials and her boyfriend Calvin Harris' can't-miss set later that evening.

Swift posted from his incredible performance during which the crowd went wild for a surprise performance by Rihanna.

"I'll NEVER forget this moment," she wrote.

Swift also debuted her new platinum bob this weekend. Check out her hair evolution here:

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