She loves to experiment with her hair and has dyed it blonde, blue and pink in the past But Demi Lovato has gone one step further and dramatically shaved one side of her head on her Neon Lights tour The 21-year-old singer debuted her new look on Twitter on Tuesday and defiantly captioned the picture ‘IDGAF [I don’t give a f**k].’She had hinted at the extreme new style in an earlier post, sharing a picture of an electric shaver and some long locks of her pink hair, with the caption, ‘So…. This happened…… Oops However, Demi appeared delighted with her new look, posing with a huge smile for her Twitter snaps, which she also shared on Instagram Lovato first debuted her pink hair at the Grammy Awards in February, but it didn’t take her long to opt for a change.She is currently on her Neon Lights Tour, which kicked off in Vancouver on February 9 with female-dominated opening acts Fifth Harmony and Little Mix Down the road, Cher Lloyd will take over as Demi’s warm-up performer from March 20 to the final show in Indianapolis on March 30 Demi has had her share of troubles including a stint in rehab, but owes her current success to clean living on and off the stage, a strict rule that she applies to everyone who works for her too.Everyone on the team is required to stay clean and focused. It’s not about trying to party,’ Demi recently told the TV show Extra ‘It’s about putting on the best show and everyone needs to be in tip top shape. That’s how it should be for every tour.’ While her professional life is going from strength to strength, Demi’s personal life is also better than ever right now.Wilmer Valderrama rekindled his romance with Demi last year and recently sparked speculation he may propose to her after being spotted buying a diamond sparkler from Tiffany & Co An eyewitness told Radar: ‘It looked like an engagement ring, but could have just been a nice expensive ring he was giving to Demi.’However, despite reports to the contrary, reps for the star confirmed last month that there was no truth behind an alleged proposal.The on-again, off-again couple were first reported to have dated back in 2010, shortly after Demi split with Joe Jonas, having met when they filmed several public service announcements together.Change it up: In December 2013, Demi sported bright blue hair but switched it up to pink just a few months later.