Chrissy Teigen & John Legend Arrive for Obama's 60th, Other Celebs Got Cut

Barack Obama's 60th birthday may have gotten scaled back from a bash to a small shindig ... but it's still about as star-studded as it gets.

Several celebs still on the guest list have been making their way to the summer garden party at the former president's $12 million Martha's Vineyard mansion to celebrate B.O. turning the big 6-0 ... including a pair of powerhouse couples -- John Legend and Chrissy Teigen, and Dwyane Wade and Gabrielle Union ... this according to the New York Times.

Don Cheadle's also arrived, and huge names like Jay-Z and Beyonce, Eddie Vedder, George Clooney and Steven Spielberg are all still expected to attend.

So who didn't make the scaled-down guest list? Many of Obama's former administration officials including David Axelrod, and many comedians like David Letterman, Conan O'Brien and Larry David ... giving the latter a fantastic idea for a future episode of "Curb Your Enthusiasm." Axelrod's the big surprise ... he engineered Obama's 2008 election victory.

As we reported ... Barack's 60th was scheduled to be a massive event, but the Obamas decided to scuttle the plan over COVID concerns with Delta surging.