Cathy Schmitz
Newlyweds Cathy Schmitz and Richard Lugner on their big dayCathy Lugner/Facebook

Playboy model Cathy Schmitz, 24, recently made headlines when she got married to 81-year-old construction billionaire Richard Lugner.

The 24-year-old tied the knot with the mogul, who is 57 years her senior, in a lavish ceremony held at the Schönbrunn Palace in Vienna.

Yet, on 'Planet Showbiz' such a seemingly bizarre pairing is far from rare. Ever since Jackie Kennedy said 'I do' to the very rich and very ancient Greek shipping tycoon Aristotle Onassis, Eros has been firing his arrow of love (or something like it) across the decades.

IBTimes UK looks at some of the celebrities who famously dated outside of their age group.

Anna Nicole Smith and J Howard Marshall II

Playboy playmate Anna Nicole Smith married 80-year-old American oil tycoon J Howard Marshall II when she was 24. He passed away a year after the wedding and a lengthy legal battle ensued over his assets.

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Anna Nicole Smith and Howard Marshall IIGetty

Mary Kate Olsen and Olivier Sarkozy

Mary-Kate Olsen, 28, has been dating Olivier Sarkozy, 45, for over a year. The unlikely couple have a 17-year age gap between them but are said to be serious and recently purchased a $6.25m (£3.8m) townhouse together in New York.

Is Mary Kate Olsen Shacking Up with Boyfriend Olivier Sarkozy?
Mary-Kate Olsen and Olivier SarkozyTwitter/@paulinelc
Jennifer Lopez and Casper Smart

Lopez, 45, divorced her husband of seven years, Marc Antony, and then got in a relationship with her backing dancer, Casper Smart, 27. Speaking of their 18-year age gap in an interview, she said: "I ask him, 'Why don't you go find a young girlfriend and get out of here? What do you want with me?'"

Jennifer Lopez and Casper Smart.
Jennifer Lopez with boyfriend Casper Smart at the Hollywood Walk of Fame ceremonyTwitter/@JLoGreece

Alec Baldwin and Hilaria Thomas

The 30 Rock actor, 56, is married to 32-year-old Yoga instructor Hilaria Thomas and their 24-year age gap hasn't got in the way of their happiness. Speaking recently on the relationship, Thomas said: "Five months into our relationship, we got an apartment together; then we started talking about getting married; then he proposed; then we got married; now we have a kid. So it all went quite fast".

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Alec Baldwin and Hilaria Thomasgetty

Joan Collins and Percy Gibson

A 32-year age gap hasn't stopped Joan Collins, 81, being happily married to Percy Gibson, 49, for over 11 years. She recently said in an interview: "I finally know the definition of true love. We are each other's best friend and accomplice."

Joan Collins
Percy Gibson and Joan CollinsGetty

Catherine Zeta Jones and Michael Douglas

The couple, who have a 25-year age gap - The Legend Of Zorro actress Catherine Zeta Jones is 44, while Wall Street star Michael Douglas is 69 - have had their ups and downs but are reportedly now going strong after 14 years of marriage.

Liberace star Michael Douglas and Catherine Zeta Jones are said to be heading for a $300m divorce
Michael Douglas and Catherine Zeta JonesReuters

Courtney Stodden and Doug Hutchison

Reality TV star Courtney Stodden courted controversy when she got married to the then 50-year-old Hutchison when she was 16. The couple divorced in 2013 citing their 34-year age gap as a contributing factor but in August 2014, the couple announced they were engaged again.

Courtney Stodden
Courtney Stodden with her husband Doug Hutchisonwww.courtneystodden.com

Al Pacino and Lucila Sola

The 74-year-old Scarface star has been dating 35-year-old Lucila Sola for the past four years. When asked about their age difference, the Argentine actress said "age is something relative" and that Al Pacino opened the doors to a fascinating cultural universe and introduced her to a whole new intellectual and artistic world.

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Al Pacino and Lucila SolaGetty