Sir Rod Stewart took the underground to his gig.

The 'I Don't Want to Talk About It' hitmaker and his wife Penny Lancaster travelled on public transport to his concert at London's iconic O2 Arena on Monday evening (27.02.17).

Penny, 45, uploaded two pictures of herself with the 72-year-old rocker riding around on London's tube network.

Captioning the pictures of the pair disguising themselves in oversized black coats and dark sunglasses, she wrote: ''Sneaking into London by train today ... From the overground to the Underground!! (sic)''

Rod was recently honoured with a knighthood and Penny has revealed he teared up when he found out he would be handed the once-in-a-lifetime honour.

She said: ''He never expected it because he thought, I've had my award, I've been granted a CBE and he was very flattered and honoured by that. But this was a shock.

''He kept having to re-read the letter and literally collapsing on the sofa and going, 'I can't believe this, I can't believe this!' He was in tears about it, really emotional.

''He was very happy after the embargo of three weeks to be able to announce it on stage. He was doing a concert the night the news came out and he was able to tell the crowd on his encore that he was about to be knighted. The place erupted.''

And Penny insists she doesn't want to be referred to as Lady Stewart.

She added: ''When we found out Rod was a knight, Alistair asked 'What does that make me?' I just said, 'It just makes you the son of a knight, darling! You don't change your name.'

''Not that I will be changing my name either. It's there for formal or official occasions but otherwise I'm still Penny! I'd never insist on being called Lady Stewart.''