The 68-year-old singer - famous for hits like Can't Smile Without You - drew gasps outside the BBC Radio 2 studios in London.
His famous conk seemed untouched but skin along his jawline appeared stretched to behind his ears.
The look is often associated with a facelift procedure, where surgical glue is used to help 'pin' drooping skin back.
Barry's cheeks looked strangely puffy too beneath his signature layers of stage make-up.
And the Copacabana hitmaker's forehead was remarkably smooth for a man in his sixties.
Rumours of plastic surgery date back to July 2003, when the star was said to have had a complete upper and lower facelift.
The op was said to have removed drooping skin from his eyelids and tightened the skin around his jawline.
But Manilow denies his current looks are the result of a surgeon's scalpel.
The legendary crooner - who has admitted to Botox jabs - said in a recent interview: "I just seem to be the guy. I’m the Joan Rivers of the plastic surgery thing [because] of one picture and the Botox.
"But I do see those pictures that they think [show] that I’ve done loads of surgery. And I know why they think that, because those pictures are weird.”
Yet Barry puts his strange appearance down to steroid jabs for chronic hip pain, rather than plastic surgery.
He said: "They had to keep giving me steroid shots. And steroid shots blow you up. They blow your body up and, most of all, they blow your face up.
“So when I see those pictures with my face blown up, they attributed that to me and bad plastic surgery."
Manilow has had surgery to correct torn cartilage in both hips in August 2006 and in December last year.
Face it, Barry, that's enough facelifts! Star looks frozen in time.
Can't Smile Without You may be one of his most famous hits, but Barry Manilow looks as though he may find it difficult to smile for anyone these days.
The singer, who has admitted to having Botox and facelifts, had an expressionless, stretched look as he performed on a U.S. TV show in Hollywood – and appeared remarkably wrinkle-free for a man who turns 68 this week.
Dr Roberto Viel, of the London Centre of Aesthetic Surgery, said the star looked ‘very unnatural’, adding: ‘In my professional opinion, Barry Manilow has had a series of cosmetic procedures – removal of under-eye bags, upper blepharoplasty [eyelid surgery] and brow lift.
‘He has also used fillers or fat transfer to the cheeks to plump up his complexion and fill out deep facial wrinkles, creases and furrows.’
Tags Barry Manilow, Plastic Surgery