She then posted the image of herself kneeling, hands behind her back, to million of followers. The picture taken at Gold Coast Airport in Queensland received 7,700 likes on Instagram.
Police officers obliged when Lily Allen asked them to play along with her joke
Unfortunately police chiefs weren't quite as impressed and an investigation into the incident has been launched.
"At her request members involved placed open handcuffs for a photo opportunity," a spokesman told the Daily Mail.
"It appears the members involved were caught in the moment and standard protocol were breached.
"It is subject to internal processes."
The image has since disappeared from Lily's social media. Since returning to the music scene after taking time out to have children, the songstress has found herself in the midst of one controversy after another.
Lily Allen was on her way to perform at the Splendour in the Grass festival
She had an argument on Twitter with model Jourdan Dunn and also admitted that one of her singles had been banned because the lyrics contained an offensive word.
However, one person who is supporting her all the way is husband Sam Cooper. During the Australian tour, on which she had ten gigs in two weeks, Lily talked about their relationship.
The singer is now on the way to Los Angeles
The mother-of-two has revealed that he encouraged her to come out of retirement and get her creative juices flowing. They married in 2011 and are parents to Ethel, three, and Marnie, one.
Lily told Aussie radio that she had been concentrating on "pureeing vegetables" and "building lego", but didn't feel fulfilled. "It was my husband who said 'Maybe you need to start writing again'. It made feel better," she said.
Husband Sam Cooper supports her career
The 29-year-old also spoke about how lucky she feels in her marriage. "I still don't feel worthy of my husband. He's an amazing person.
"I am very lucky to even have contact with someone like that – never mind be married to them and have children."