David Beckham Made Fun of Victoria Beckham's Teeth in a Rare Smiling Photo

It is universally acknowledged that Victoria Beckham rarely smiles in photos (even Beckham herself has talked about it), so when she does, it's cause for notice — in this case, with a picture on her son's Instagram page.

On Tuesday, 15-year-old Cruz Beckham shared a photo of himself with his grinning mother, writing, "Apparently my mum does smile."

The photo prompted a reply from David Beckham, who poked fun at his wife's teeth in a comment: "How white are mums @victoriabeckham teeth ? it's Ross from friends," adding a laughing emoji.

For those who don't remember, the comment refers to one of Friends's most memorable episodes, in which Ross has a snafu involving some teeth whitener.

Honestly, bonus points to David for the reference.

Victoria previously poked fun at the rumor that she never smiles, and referenced her reluctance during an interview with Glamour UK last year: "I want to be honest. In the past, I've probably hidden behind my armor – the not smiling publicly, for instance. There's less of that now."

"There's something really liberating about embracing who I am at 45 years old and owning it, feeling confident, feeling content," she said. "Doing beauty has really helped with that – it's been very liberating. I want to spread the word that everybody should feel like the best version of themselves. To look after what you have. I want to tell people to own who you are. Yes, we – and I – have wrinkles, and that's OK!"