The pop star's decline began in 2007, after losing custody of her two children with Kevin Federline - Sean and Jayden. The then 26-year-old was pictured behaving erratically in public, including shaving her head and attacking paparazzi with an umbrella, and was eventually admitted to UCLA Medical Center's psychiatric hospital in Los Angeles in January, 2008.

Her father Jamie was granted temporary conservatorship while she was in hospital, and is still in charge of her personal life and finances to this day, along with Britney's lawyer Andrew M. Wallet.

She touched upon her turbulent past in a new interview, describing that period of her life as unpleasant. "I like my thirties way more than my twenties," the 34-year-old told The Sun newspaper. "My twenties were horrible. My teens were fun.

"But I like my thirties - my thirties are great. You know who you really are," added the Womanizer hitmaker who has turned her life around since then. She's in the midst of a money-spinning residency at Planet Hollywood Resort in Las Vegas, and on Tuesday (27Sep16) she made a triumphant return to the stage in the U.K. with an impressive gig at the Apple Music Festival in London.

Now, she has a great relationship with her two boys, who she temporarily lost custody of during her public meltdown. But the mother-of-two, who regularly shares photos and videos of Sean, 11, and Jayden, 10, on Instagram, is worried about her boys growing up too fast.

"It’s a little strange. I’m nervous because I know 12 and 13 and 14 and 15 are going to be really scary," she shared. "I’m going to be like, ‘Mum please come to the house and help me out! But no, it’s a great age. They are still babies."

And Britney, who split from US film and TV producer boss Charlie Ebersol last year (15), said she is loving being single. "I am in a really good place right now. I am loving and learning about myself every day and learning who I am.

"It’s awakening, it’s cool. It’s OK to be single - it totally is," she added.