Robbie Williams had Botox after being told he had aged.

The 'Let Me Entertain You' hitmaker has admitted to undergoing the cosmetic procedure after seeing comments on social media about his appearance.

He said: ''I've had Botox and some fillers and something done to my chin. And I really like it. With the last few albums I put out I looked on social media people were saying, 'F**k he's aged.' And I was like, 'Yeah, I have.'

''I was tired, I had mental illness and stress and whatever was going on up there was coming out in my face. The truth of my mind was written on my face.''

And the 42-year-old singer - who has four-year-old Theodora and two-year-old Charlton with his wife Ayda Field - also admitted to having things done to alter his hair but says he stopped after he saw photos of himself with his ''badly dyed hair''.

He added: ''Guys don't talk about having their hair done. They do not talk about it in public, but I did. I thought, 'Yeah, I'm gonna try this s**t out.' I had something done I didn't need done, I was just bored. I will try anything once. Not just related to vanity, but anything. Kangaroo meat? Sure, let's have some f***ing kangaroo.

''Pop stars shouldn't be grey but pop stars also shouldn't have badly dyed hair! I saw a few photos of myself with badly dyed hair and I thought being grey is infinitely better than that f***ing mess you've got on your head right now. So this is it, I'm going for it. I'm 42. In pop star years that's 1042 years old.''

Robbie makes a point of reading ''everything'' that is put online about him but admits it ''crushes the soul''.

He told ''I read everything. Yes it's dangerous. Yes it crushes the soul. But I'm addicted to it. Yes I concentrate on the bad ones.

''I'm addicted to a lot of stuff that makes me feel full stop. Feel angry. There's an energy in that that's addictive. I'm addicted to stuff that strokes my ego, there's an energy to that. I'm addicted to everything about it.''