Nine-year-old Samuel Smith surprised the Earl of Wessex when he launched himself into the pool while doing a salute.
Prince Edward toured the newly refurbished £14million swimming centre and unveiled a commemorative plaque to mark the occasion.
The centre will host the swimming events during Glasgow's Commonwealth Games next year.
The Prince met with Samuel and his class mates as they took part in a swimming lesson in the teaching pool.
Before the unveiling Prince Edward joked with onlookers, asking them to cheer loudly as soon as the red velvet curtains covering the plaque were opened.
He told the crowd: "I will try and make this look as slick and professional as possible but I want you to know it has taken years and years of practice and I am still practising."
He added: "Thank you for inviting me to join you today.
"I am very pleased to be here at Tollcross to see this fantastic development and talk to a few people enjoying the new facilities and everyone seems to be enjoying it very much."
During the hour-long tour, Prince Edward met members of the City of Glasgow Swim Team who train in the newly refurbished 10-lane, 50m swimming pool.
Zoe Scott, 16, from Sandyhills, trains at the centre eight times a week. She said: "He was so nice, he was asking if we had seen an improvement with the place being done up. I said it is so much nicer to train here with everything being refurbished.
"I can't wait for the Commonwealth Games, it will be really good, a lot of the older guys will be swimming at it so hopefully we will be here to support them."
Following the revamp, Tollcross has an extra 1000 seats beside the pool and an extra 3000 will be added for Games time. A new six-lane, 50m, warm-up pool has also been built.
Prince Edward was joined by the Lord Provost Councillor Sadie Docherty, councillor Archie Graham, executive member for Commonwealth Games 2014, chairman of Glasgow Life and depute leader of Glasgow City Council, and Commonwealth Games Minister Shona Robison MSP.
CHAIRMAN of Commonwealth Games Scotland Michael Cavanagh and David Grevemberg, chief executive for Glasgow 2014 Commonwealth Games, were also in the prestigious group.
During the visit the main pool was divided in half and Prince Edward watched a water polo game before meeting some of the players. Fran Collings, 16, who travels from the south of England to train at Tollcross with the Scottish team, said the Prince asked her whether she enjoyed playing at Tollcross. She said: "It is a really good pool. It is big so we can have big events."
Her team-mate Angus Cameron, 15, from Dunblane, said: "It's a little nerve wracking to meet the Prince but it is good to show off the sport."
Next, Prince Edward watched an aqua aerobic fitness class in the six-lane warm-up pool before meeting with pupils from Wellshot Primary as they took part in a swimming lesson.
Samuel Smith, who did an impromptu jump to impress the Prince, said: "It was good to give the salute. I just thought I'd do it as I jumped in because he's royalty. It's great."
SCOTT KNOX, 9, said: "He asked me 'do I come here often' and I told him 'yes' and he was asking 'do you like swimming?'
"It is really exciting."
Councillor Graham welcomed the Prince to Tollcross International Swimming Centre where, he said, 150,000 people had visited since it re-opened in May, making it the busiest leisure facility in the city.
Councillor Graham added: "The new venue will provide a real and lasting legacy for all of our communities as we build a more active Glasgow for future generations."
Members of the public who were using the sports facilities gathered to watch Prince Edward unveil the plaque.
Mary McLaughlin, 60, who lives nearby, was in the gym when she saw the Prince.
He later talked to her and her friends in the cafe. She said: "He was asking about the swimming pool and he was very pleasant."
Sports minister Shona Robison said: "The opening is another landmark in the fantastic pool's history and it is really great to hear that it is one of the busiest facilities in Glasgow now.
"It is going to have a great atmosphere during the Games."