The British comedian sent Katy a message on Twitter before her haltime set and she is annoyed he had to "involve himself"
Katy Perry was reportedly pretty ticked off that her ex-husband Russell Brand tweeted her ahead of her huge Super Bowl performance.
The Firework hitmaker was preparing for the biggest moment in her career at the weekend when the British comic decided to take to Twitter to wish her good luck, despite not speaking to her after their bitter split.
Russ, who informed his ex their marriage was over via text message in 2011, posted on the social media site: "Super Bowl may be baffling to Brits but half time show will be amazing. Good luck KP."
The pair, who married in 2010, split just a year later and Russell has had plenty of public digs at his ex, who is annoyed he had to "involve himself" ahead of her Halftime Show.
A source told The Sun newspaper: "She couldn't believe he'd say that after everything he put her through.
"This was the man who, quite literally, destroyed her heart. He slagged her off publicly around the world.
"Then on the biggest night of her life professionally, he could not resist involving himself."
Cheeky Russell, 39, posted the message for his 9 million followers to see and Katy, who said she hadn't heard from him since their split, has not bothered responding.
Despite the fireworks with her ex, Katy looked incredible during his Super Bowl performance and took to the stage in a red hot fire ensemble before a number of costume changes.
She was joined on stage by rocker Lenny Kravitz and rap legend Missy Elliott - the crowd went crazy as more than 100 million people tuned in for the show.
Meanwhile, Russell, who would regularly take Katy to watch his beloved West Ham play at Upton Park while they were together, must be getting a bit lonely on living as a singleton.
While Katy is currently on a sell out world tour (you go, girl), Russell is getting in rows about house rent prices - and of course he recently split from Jemima Khan.
Maybe he wishes things had worked out differently but KP is too busy rekindling her romance with ex John Mayer to worry about what could have been.
Mirror Celeb has contacted Katy's rep for a comment.