An 11-year-old Blue Peter fan has become the first viewer to present the long-running show.
Ryan said he had enjoyed his presenter's stint
Ryan Gilpin, from Sheffield, won a national contest to host the live BBC One show, marking its 45th anniversary.
On Wednesday he appeared alongside regular hosts Simon Thomas, Konnie Huq, Matt Baker and Liz Barker after his show reel impressed Blue Peter bosses.
The youngster was seen trampolining and putting George the tortoise into hibernation.
Ryan said he had thoroughly enjoyed his stint presenting the show - becoming its youngest ever host.
During the show he tested rollercoasters with Thomas, and introduced guests - including pop group Liberty X - and feature items alongside the four hosts.
Ryan was also seen interviewing some of the guests, in the studio and on film. He received a kiss from Huq, his favourite show presenter.
The Blue Peter badge is temporarily changing
To mark the milestone anniversary, the show is issuing a revamped version of its famous Blue Peter badge, using a more modern image for the anniversary year.
Viewers and competition winners have been awarded the badges for decades, giving them free access to more than 100 places of interest.
Celebrity guests who have received their own badges include The Queen, Sir David Attenborough, Tom Hanks and Brad Pitt.
Programme editor Richard Marson said: "This is a very special occasion for Blue Peter.
"The Blue Peter badge hasn't been changed for the last 15 years and we thought that this would be a fantastic way to celebrate our birthday."
The show, which began in 1958, received taped birthday greetings from celebrities including singers Britney Spears, Mark Owen and Pink; actor Brad Pitt; presenters Jonathan Ross and Gary Lineker; and children's favourite Basil Brush.