And as @cable1973 points out, the 'bring a friend' concept is the scene stealer.

He casts his own mother in a tiny part, then makes her a scene stealer.

The scene stealers, though, are the live ducks in the pond outside.

Either that or she was the best little scene stealer I had come across in a long long time.

He's splendid, the real scene stealer, the soul of the enterprise.

The bar rivals the view as a scene stealer.

The scene stealers are the spots of decay attacking those documentary images.

He is also something of a scene stealer.

But Jelly, the don's trusted lieutenant, is an occasional scene stealer.

Our correspondent, by way of his opener, referred to her as a natural-born scene stealer.