David Bowie’s son seemed to take a swipe at Lady Gaga after she performed a tribute medley of the late singer’s hits at the Grammys.
Film director Duncan Jones took to social media as he appeared less than impressed with her song and dance performance in Los Angeles.
On Twitter, he shared with his 277,000 followers a dictionary definition of the word “gaga”.
He wrote: “Overexcited or irrational, typically as a result of infatuation or excessive enthusiasm; mentally confused.” Damn it! What IS that word!?”
The 29-year-old US singer opened her performance dressed as Ziggy Stardust, complete with newly-dyed red hair, singing Space Oddity.
She then broke into Changes, Ziggy Stardust, Suffragette City, Rebel Rebel, Fashion, Fame, Let’s Dance and Heroes.
Her medley also included flashing multi-coloured lights and images of her on a large screen.
One featured a close-up of her face with a lightning bolt of red make-up – a nod to Bowie’s cover from his sixth album Aladdin Sane.
Gaga received a standing ovation from the crowd at the end as she embraced Chic’s Nile Rodgers, one of Bowie’s producers who joined her for the performance.
The tribute to Bowie, who died aged 69 in January of cancer, was widely seen as one of the highlights of the awards ceremony.