Dog adoption officials insisted on checking out John Legend's tour bus before agreeing to let the All Of Me singer and his model wife Chrissy Teigen sign on to take charge of a three-legged dog.

The couple fell in love with Penny at a Los Angeles shelter, but bosses there were far from convinced the couple would make perfect pet owners and asked to tour Legend's home on wheels, where the pooch would spend part of her life.

Teigen explains, "We filled out an application and the woman from the rescue was like, 'Well, I know you're a musician and I know musicians are into drugs...' She goes, 'I need to see John's motor home'.

"She came on the tour bus - John was touring through Savannah (Georgia) - checked it out to make sure there were no loose wires or meth or whatever. Penny was a serious purchase."