It's May 4, which means Star Wars fans, Twitter users and everyone in between will be greeting each other with May the fourth be with you messages all day long.

The pun-filled fan-created holiday, recognized by many as Star Wars Day, has inspired gatherings and celebrations of all sorts, including a t-shirt design contest, a LEGO store mosaic, free Star Wars cookies at select Williams-Sonoma stores and special discounts off Star Wars products, as listed on the official Star Wars website.

In Toronto, Canada, fans are gathering for the second annual Intergalactic Star Wars Day at the Toronto Underground Cinema, complete with a trivia game show (based on the original trilogy) and a costume contest. All proceeds will benefit the Sick Kids Foundation.

But Star Wars fans, and the fake Darth Vader Twitter account, aren't the only ones having all the fun on May the Fourth.

A number of celebrities will be blowing birthday candles on Friday, including Will Arnett, former NSYNC member Lance Bass, Saturday Night Live alum Ana Gasteyer and others.

Click through to see which famous faces are celebrating birthdays on May 4, and May the Fourth be with you.

Will Arnett
Funnyman Will Arnett is turning 42 on May 4. The Canadian actor has a busy summer ahead, thanks to the reunion of his “Arrested Development” family. REUTERS
Bass
Jason Collins sought advice from openly gay friend Lance Bass, pictured, before coming out on Monday. Reuters
Mike Dirnt
Green Day bassist Mike Dirnt turns 39 on Friday. The boys of Green Day are gearing up for a busy fall, with the scheduled release of a “Uno!” “Dos” and “Tré” -- a trilogy of albums to be released in September, November and January 2013 respectively. REUTERS
Ana Gasteyer
Ana Gasteyer will be blowing out 45 birthday candles on May 4. The “Saturday Night Live” alum has enjoyed a strong 2011-2012 television season, thanks to the ABC sitcom “Suburgatory,” alongside Jeremy Sisto and the equally funny Cheryl Hines. REUTERS
Mick Mars
The other rocker celebrating a May 4th birthday on this list is Motley Crue guitarist Mick Mars, who turns 61 on Friday. REUTERS
Katherine Jackson
Michael Jackson’s mother, Katherine, turns 81 on May 4. REUTERS
Randy Travis
Country legend Randy Travis REUTERS
Audrey Hepburn
Go ahead, Audrey Hepburn fans, celebrate what would have been the actress’ 83rd birthday by watching “Breakfast at Tiffany’s,” complete with the famous little black dress, pearls and hat. REUTERS
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