Funny? Yes. But not for the reasons they want it to be.
Of course celebrities were going to get in on this, with a few unlikely entries. These aren't funny because these are the Unlikely Celebrities Doing The Harlem Shake, they're funny because someone-possibly on their social media teams, though also, possibly the celebrity themselves-suggested they do this, and thought it was a good idea and a way to improve their image or exposure. Which it isn't. It just makes them look like the rest of the assholes on the Internet doing the Harlem Shake.