Spoiler Alert! Fan of Fox's hit reality show The Masked Singer love to watch every performance and try to guess who the secret celebrity is under the mask, just like the judges. This week former teen heartthrob and 90210 star Brian Austin Green shocked and surprised all the judges on the panel as well as the viewers at home when he revealed himself to be behind the giraffe mask.

Green stumped judges Nicole Scherzinger, Ken Jeong, Joel McHale, Jenny McCarthy, and Robin Thicke with his appearance on the show, despite the fact that he and Thicke have been friends since they were teens! “We were best friends as teenagers,” Thick said after Green revealed his elaborate giraffe mask. “I used to go to the ‘90210’ set with him all the time. I love you. I can’t believe that’s you.” Green also couldn't believe that none of the judges guessed his identity, especially Thicke.

"We were best friends for like three years," Green said of the Blurred Lines singer. "We would spend every night either at his house or at my house. We went camping. We did all sorts of stuff together. If anybody was going to recognize my voice in this costume it was going to be him. He knows the rhythm of how I speak, the sound, the tone of my voice, all of that. He knows my voice better than anyone, probably aside from my parents and my family."

Related: This Singer's Kids Were Shocked That Their Dad Was On ‘The Masked Singer’

Although none of the judges correctly guessed Green's identity, some were pretty close.  Guest judge Joel McHale was probably the closest, guessing that the giraffe was Green's 90210 co-star Jason Priestly, while  Ken Jeong guessed Shia LaBeouf, who just so happened to star with Green's ex-wife Megan Fox in Transformers.

Green told TV Insider that he decided to join the reality competition because he was 'bored." "Everyone's sitting at home. It's the pandemic. I had spent five months in my house and the idea of, "Oh, I can go do something and still entertain people but in this way," it just seemed like the perfect show," he said. He went on to add that he really enjoyed the anonymity the costume gave him despite it being incredibly hot behind the mask. "It's really challenging to be in front of people who can speak and you can do nothing but mime. You sort of feel like a Disneyland character, and you're just doing thumbs up and hand gestures and all these things because they can't see your face," he said.

Green is the latest celebrity to be unmasked in the 4th season of the hit show. Did you guess it was him?

Read Next: '90210' Alum Has To Defend His Young Sons Because They Have Long Hair

Source: TV Insider