Well, at least she made it to the bachelorette party.
That's surprising, considering the Grammy winner and boyfriend Matt Kemp were on the guest list for the big shindig in India.
So why the no-show?
Turns out it simply came down to a conflict with Rihanna's work schedule, a source close to Kemp tells E! News, and that the decision not to attend was "a last-minute change of plans."
"He was telling me [last] Saturday that he was leaving the country for a week with Rihanna," the source explains. "But then on Tuesday, he told me they weren't going."
Rihanna instead has headed to New York to put the finishing touches on her upcoming album (due Nov. 2) and prepare to promote her new book.
—Reporting by Claudia Rosenbaum