Boomer Phelps's latest Instagram photo is quite possibly his cutest yet


There's cute, and then there's Boomer Phelps.

As Michael Phelps took his Olympic gold medal-winning tally to 21, on the fourth night of finals at the Rio Games, his 3-month-old baby celebrated with an adorable outfit.

Sure, we get Boomer won't have had much input in choosing the clothes himself, but check out those stars and stripes trousers, that "team daddy" top and, hang on a minute, are they GOLD booties?!

It's not often we'll accept the hashtag #pantsonfleek (which accompanied the snap's caption on Insta of "way to go daddy") but in the case of Boomer, it's totally fine.

Just LOOK at him.

His Insta has really taken off since the Olympics. His 247,000 followers have seen him have all sorts of fun - and in all sorts of cool and patriotic outfits.

And, just ICYMI, here's some snaps of Boomer watching Dad compete in the men's 200-metre butterfly final, when he wore possibly the best ear protection ever.

United States' Michael Phelps' son Boomer wears ear protection during the swimming competitions at the 2016 Summer Olympics
(Michael Sohn/AP)

The family of United States' Michael Phelps, mother Debbie, left, and his fiance Nicole Johnson holding their baby Boomer
(Lee Jin-man/AP)

United States' Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly
(Matt Slocum/AP)

OK, now we really can't stop saying "awwwwww".