It’s long been a custom for celebrities staying at hotels, hospitals, and other places to do so under a fake name. It allows them to maintain a little bit of privacy. The next time you’re at a hotel, see if you spot any of these names on the register.

Beyoncé

When she recently checked into a New York City hospital for the delivery of twins, Beyoncé used the name “Ingrid Jackson.” There were rumors that this was the name of a surrogate who carried the babies, but that’s the same name Beyoncé uses when she stays at hotels.

Jay Z

Ingrid Jackson has been known to stay at places with Frank Sinatra. The real one died in 1998; that’s the fake name Beyoncé’s husband, Jay Z, likes to use.

George Clooney

The whole point of using a fake name at a hotel is to not bring any unwanted attention. That’s why it’s pretty funny that George Clooney checks into hotels under the name “Arnold Schwarzenegger.”

Brad Pitt

Brad Pitt found a name that sounds a little like his own name, and a little like a side dish: Bryce Pilaf.

Jennifer Aniston

Jennifer Aniston’s fake name of choice is Mrs. Smith…as in Mr. and Mrs. Smith, the movie where her ex-husband Brad Pitt first met his next wife, Angelina Jolie.

Justin Timberlake

Justin Timberlake goes by Mr. Woodpond—which is comprised of two synonyms for each of the individual words that make up his real last name. Timber = wood, and lake = pond.

Kid Rock

Kid Rock could use his real name – Bob Ritchie – but he instead uses the real name of a fictional character best known for using an alias. He checks in under Dick Grayson, the real name of Batman’s crimefighting partner Robin.

Paul McCartney

Back in the early ’60s, Paul McCartney toyed with using a stage name, Paul Ramon. He also used the name to check in to hotels and remain anonymous. In the ’70s, the punk band the Ramones formed and took their name from McCartney’s fake name.

More McCartney

More recently, McCartney stays at hotels as Apollo C. Vermouth. That’s a pseudonym he used in the ‘70s when he produced songs by other musicians.

Tom Cruise

Tom Cruise reportedly checks in as Cage Hunt. The “Cage” is a reference to Lt. Col. Bill Cage, his character from Edge of Tomorrow, and the “Hunt” refers to Ethan Hunt, who he plays in the Mission Impossible movies.