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Kate Middleton -

Catherine, Duchess of Cambridge discretely yawns at the balcony of Buckingham Palace during Trooping the Colour, Queen Elizabeth II's birthday parade, on June 14, 2014.

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Kate Moss -

The former supermodel showing some signs of tiredness at a restaurant in New York City in April 2006.

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Britney Spears -

Hit me tiredness one more time! The singer relaxes while her sons enjoy the pool in Marina Del Rey, California, in August 2009.

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Cristiano Ronaldo -

A young and spotty Cristiano Ronaldo, looking pretty bored, back when he was a Manchester United player.

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Katie Holmes -

The actress is spotted yawning outside the 'Good Morning America' set on October 9, 2013, in New York City.

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Michael J Fox -

The 'Back to the Future' star is spotted yawning while filming in 2013.

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Arnold Schwarzenegger -

"I'll be back (in bed, soon)!" The actor and former governor of California yawns as he attends the Pope's audience at the Vatican on January 25, 2017.

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America Ferrera -

The 'Ugly Betty' star looks a bit tired of playing softball. Here she is yawning on set, in April 2008.

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Hilary Duff -

The actress goes out for a morning (iced) coffee run, even though she doesn't look ready to get out of bed just yet.

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Adam Sandler -

Is Jennifer Aniston that boring? The actor shoots a scene of the movie 'Just Go with It' in LA.

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Demi Lovato -

How boring is hanging out with friends on a yacht in Miami, right? The singer was not feeling it, apparently.

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Tom Cruise -

The actor is such an adrenaline junkie that the car action scene he was shooting with Emily Blunt in London was boring him.

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Kristen Bell -

The actress is seen on the set of 'House of Lies' on November 21, 2012. She looks a bit tired...

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Don Johnson -

We bet the actor would rather be in Miami, chasing criminals wearing a white, oversized blazer with the sleeves rolled up, than be at the 2005 Roland Garros Tennis Tournament in Paris.

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Simon Cowell -

We know, Simon–not everyone who goes on 'Britain's Got Talent' actually has talent. Here's the judge, looking pretty bored during series 7 of the show in 2013.

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Neymar -

We wonder if had a good night's sleep before this Brazil training session during the FIFA World Cup in Russia in 2018.

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Robert Downey, Jr. -

Wakey, wakey, Iron Man! The actor and his wife, Susan Downey, are seen in West Hollywood, California on February 23, 2009.

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Shaquille O'Neal -

The NBA star yawns during a Los Angeles Lakers game against the Utah Jazz in 1997.

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Venus Williams -

How boring was the opening ceremony of the World Team Challenge 2009 tournament in Hong Kong?

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Tobey Maguire -

It looks like Spider-Man found the game between the Los Angeles Lakers and the Chicago Bulls on November 21, 2004 a bit boring!

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Kirsten Dunst -

Another actress yawning on set. This time, during the shooting of 'Mona Lisa Smiles' on January 13, 2003, in New York City.

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Miley Cyrus -

The singer yawns at the 16th Annual EIF Revlon Run/Walk for Women on May 9, 2009, in Los Angeles. It was early in the morning, apparently.

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Queen Elizabeth II -

Did you think you'd see the Queen with her mouth wide open? Never! She discretely yawns during a visit to the Indian National Defence Academy in Pune, India, on November 21, 1983.

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Rafael Nadal -

The Spanish tennis star yawns while practicing during Wimbledon on June 30, 2011.

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Barack Obama -

President Barack Obama looking tired during a meeting at the Warsaw NATO Summit on July 8, 2016 in Warsaw, Poland.

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Lionel Messi -

The Argentinian soccer star yawns during the FIFA World Cup in Brazil in 2014.

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Michelle Obama -

The then-First Lady yawns while watching the Oregon State University vs. University of Akron college basketball game in Honolulu, Hawaii, on December 22, 2013.

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Pep Guardiola -

The famous Spanish soccer manager yawns before a match between Burnley FC and Manchester City at Turf Moor on December 3, 2019.

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Audrey Hepburn -

The late actress yawns as she poses in 1954.

Sources: (ScienceDirect) 

See also: Celebs caught wearing matching outfits

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