Zac Efron shocked his Instagram followers with his latest steamy sauna selfie.
The topless photo had fans looking twice as at first glance it looks like Zac, 31, may have revealed more than he bargained for.
Zac's bulge is clearly visible in the snap, as he smoulders in the sauna with his abs on show.
His drawstring on his shorts is poking up over his stomach and it creates a phallic shape that sent pulses racing.
His blushing followers flocked to comment to find out if they were seeing what they thought they were.
"What’s coming out of his pants?" questioned one.
"Definitely had to do a double take and a little zoom there", confessed another.
"It took me forever to realize thats your belt sticking out and not something else", added a third.
Another explained: "Pretty sure it's a string from his shorts sticking out !! But totally get why people are wondering what it is".
Spice Girl Mel B recently refused to deny that she had enjoyed a fling with Zac.
Speaking on ITV’s ‘Life Stories’, Mel was quizzed about which famous men she had slept with, leaving viewers stunned.
While the 43-year-old confirmed that at the height of her fame, Peter Andre became a regular feature of her bedroom, she declined to comment on another singer rumoured to have been on her list of “booty calls”.
Piers asked Mel if she had ever hooked up with Hollywood star Zac.
In an uncharacteristically shy manner, Scary Spice simply sighed as she shrugged her shoulders.
The gesture prompted Piers to continue to press her for an answer.
When he said: “No denial?!” the mum-of-three cheekily responded: “no comment!”
The lack of admission or denial left fans scratching their head at the rumoured dalliance.
Flocking to Twitter , one stunned fan wrote: “MEL B AND ZAC EFRON HAD A THING??????? Wait, what??”.
Another tweeted: “Ehhhhh no way has @ZacEfron slept with Mel B #piersmorgan”.
News of their potential hook-ups have made the rounds before.
In September last year, The Sun reported that Mel and Zac had enjoyed a steamy romp after meeting in Los Angeles.
Reports suggested the pair had met on an exclusive dating app before swapping flirtatious messages.
One source claimed that while the pair enjoyed their time together, it was “hardly a meeting of the minds.”
