Sources told Rob Shuter’s #ShuterScoop that Blake Lively was deliberately cut from the guest list for Gomez’s all-out, sequins-and-satin 33rd bash. “This wasn’t some innocent oversight,” one insider said. “It was personal.” And that personal reason? Taylor Swift.

The besties were seen posing together in a pool of balloons in a carousel shared by Gomez via Instagram Sunday.

Blake Lively was allegedly excluded from Selena Gomez's 33rd birthday celebration by Taylor Swift, who found Lively's ongoing legal troubles with co-star Justin Baldoni unacceptable.

Selena Gomez and Taylor Swift have been friends for years. The pair bonded when they were both teenagers in the entertainment industry, and their friendship has been going strong ever since.