Tulisa Contostavlos has denied she’s had plastic surgery, but admitted to having dermal filler injections.

The singer’s changing appearance has sparked plenty of speculation that she has had some work done.

Tulisa outside court

Tulisa looked different during her court case (PA)

Now the former N-Dubz star, 26, has told Grazia magazine of her changing appearance: “I looked really gaunt from the stress (of the trial).

“I wanted to perk myself up a bit and I’d always wanted my lips done.

“But with the cheeks, I didn’t know that I suffered from water retention, and the first thing that fillers do is draw water to the area so it started swelling up.”

Tulisa at the X Factor

Tulisa during her time as X Factor judge (PA)

She added: “The worst thing is that it would happen in the morning, so I would wake up like a blow fish when I was going to court.

“I’ve been having collagen waves to take them down. I haven’t had surgery, though. If I had, I’d just say.”

Tulisa in 2011

N-Dubz star Tulisa in 2011 (PA)

Tulisa had been accused of boasting that she could ‘sort out’ cocaine for the Sun On Sunday’s investigative reporter Mazher Mahmood.

She always denied the allegations and the trial collapsed after the judge said there were ‘strong grounds’ to believe Mazher, known as the Fake Sheikh, had lied on the witness stand and ‘had been manipulating the evidence’.

Tulisa as guest judge on the X Factor

Tulisa as guest judge on the X Factor (ITV)

Tulisa, who is releasing a new single, Living Without You, said she became stronger after her failed suicide attempt.

“It was, thank God, a failed attempt,” she told the magazine.

“The next day I woke up and said to (her PA) Gareth, ‘Book me a studio session now.’”