Do YOU know Jackie O's real name?
She's known to millions of Australians as Jackie 'O' Henderson.
But do you remember her original surname, from before her marriages to Lee Henderson and 'Ugly' Phil O'Neil?
The KIIS FM radio star's full name at birth is rarely publicised and, in the past, even her co-host Kyle Sandilands has forgotten what it is.
Do YOU know Jackie O's real name? The KIIS FM radio host's little-known full moniker from before she married husband Lee Henderson has been revealed
According to her IMDB profile, Jackie's full name at birth was Jacqueline Ellen Last.
After marrying British photographer Lee Henderson in 2003, the 43-year-old adopted her husband's surname.
In news articles from the mid- to late-2000s, Jackie was sometimes referred to as Jackie O'Neil, suggesting she still went by her first husband's surname at the time.
Throwback: According to her IMDB profile, Jackie's full name at birth was Jacqueline Ellen Last
She was also called 'Jackie O'Neil Henderson' in some media reports until a few years ago, but this has since dropped out of use.
Jackie appears to ignore her middle name, Ellen, for professional purposes and she does not appeared to have ever been billed as Jacqueline during her radio career.
Jackie isn't the only celebrity whose full name may surprise fans.
Blast from the past! In news articles from the mid- to late-2000s, Jackie was sometimes referred to as Jackie O'Neil, suggesting she went by her first husband's surname at the time
Ronan Keating's wife, Australian former TV producer Storm Keating, was born Sharyn Storm Uechtritz.
However, she has been known by her middle name for most of her life and adopted her famous husband's surname when they married in 2015.
Sydney-born actress Mary Rose Byrne is another celebrity who chooses to go by her middle name.
Fun fact! Jackie O isn't the only celebrity whose full name may surprise fans as Ronan Keating's Australian wife Storm was actually born Sharyn Storm Uechtritz
Surprise! Actress Mary Rose Byrne is another celebrity who chooses to go by her middle name
Born in Victoria, actress Portia de Rossi was given the name Amanda Lee Rogers by her parents, Margaret and Barry.
But, at age 15, she changed her name after being inspired by a character in Shakespeare's The Merchant of Venice.
Meanwhile, New Zealand singer Lorde is known to her family as Ella Yelich-O'Connor.
Exotic moniker: Born in Victoria, Portia de Rossi was given the name Amanda Lee Rogers by her parents but decided to change it in her teens
Stage name: New Zealand singer Lorde is known to her family as Ella Yelich-O'Connor
Humble beginnings: Rapper Iggy Azalea was simply Amethyst Amelia Kelly to the locals growing up in country New South Wales
And rapper Iggy Azalea was simply Amethyst Amelia Kelly to the locals growing up in country New South Wales.
Many Australians will also be surprised to learn that TV personality Rove McManus' first name is actually John.
This little-known fact actually stumped a contestant on Millionaire Hot Seat in 2016.