90210

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The mysterious event will include the video premieres of "Pick Up the Phone" and "90210." It will also feature a James Turrell installation.

Another photo shows him laying down on his couch in his lounge area with the caption "relaxing in 90210." 

While 'Friends' was his biggest claim to fame, Mathew had starred/guest starred in countless other TV shows over the years -- such as 'Boys Will Be Boys,' 'Growing Pains,' 'Silver Spoons,' 'Charles in Charge,' 'Sydney,' 'Beverly Hills, 90210