Lock up your mums! Donny Osmond is the star guest on Brendan O'Connor's Saturday Night Show tomorrow night.

55-year-old Donny, who returns to Dublin for a gig with his equally-toothsome sister Marie at the end of January, is a chat show warhorse. He's great self-deprecating value when he talks about his life as a teen idol who survived the madness and about his decades' long career and his plans for the future.

Brendan will also arch an eyebrow in the general direction of Steve Collins. The former world boxing champ will talk about this week's shock announcement that he plans to return to the ring at the age of 48 for his first professional fight in 16 years.

Legendary photographer Terry O’Neill talks about his life and work through the decades and reveals the stories behind some of his iconic photos of Frank Sinatra, Audrey Hepburn and Brigitte Bardot.

This year’s Operation Transformation leaders also visit to discuss their motivation for taking part in the series and look to the challenges ahead.

Catch it all on The Saturday Night Show on RTÉ One tomorrow night at 9.50pm.