Russell Brand. Picture: REUTERS

Russell Brand serenaded his wife on their first wedding anniversary on Sunday with a rendition of the song 'Inside of You' from his 2009 comedy film 'Forgetting Sarah Marshall'.

The 43-year-old comedian took to Twitter on Sunday to share a clip of him singing the track 'Inside of You' from the 2008 rom-com - in which he played rocker Aldous Snow - to his lifestyle blogger spouse Laura Gallacher.

In the video, he can be heard belting out: "Old as Ancient Skies/I've had these wondering eyes.

"But you took me by surprise when you let me inside of you/Inside of you/Inside of you.

"I long to be, is it wrong to be, inside of you."

The 'Rock of Ages' actor then thanks his co-star Jason Segel for making the song and wished Laura a "Happy Anniversary".

The British star welcomed a second daughter with Laura - with whom he already has 21-month-old tot Mabel - a month ago and recently admitted he has found "peace and serenity" since having a family.

The couple live in the English countryside with their two children and the reformed hell-raiser said his happy home life has transformed him as a man.

When asked if parenthood had changed him, he replied: "Yes. I think it's inevitable that it changes you. You can be changed by a yoghurt. So parenthood ... I've got so much peace and serenity in my domestic life that I don't have the same sort of buccaneer attitude."

Laura, Mabel and Russell Brand. Picture: Bang Showbiz

Russell - who was previously wed to pop superstar Katy Perry - couldn't be happier with the quiet lifestyle he leads these days, even if being a family man is more tiring than going out partying.

He said: "I feel happier living with a person, having to pick up dog poo and change nappies than I ever did being involved in more decadent activity.

"It's tiring picking up poo and being more ordinary and real, but it's a relief. It feels connected and purposeful."