Three university friends running up the Philadelphian steps made famous by boxing movie ‘Rocky’ were greeted with a huge surprise at the top.

As the chums celebrated their climb, a voice behind them said: “You guys got up here pretty fast. You’re making me look bad.”

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That voice belonged to Sylvester Stallone, who played Rocky six times on the big screen.

The actor kindly agreed to take a picture with the star-struck group.

Mr Stallone was in the city to film Creed, the seventh movie in the Rocky series.

John Travolta gives the thumbs up to his random new gym buddy.

One of the boy’s fathers posted the priceless photo to Facebook, where it was first picked up by the Philadelphia Inquirer.

No mention was made of whether Rocky was lifting his arms in triumph when discovered, but we can only hope.

Another big-name selfie was scored from a random encounter recently.

John Travolta reportedly interrupted a fellow male gym goer’s 3am workout for an early morning conversation.

The star supposedly indulged in a little chatter with the man before agreeing to a photo.