Team GB's golden couple Laura Trott and Jason Kenny powered to victory in the Rio velodrome, adding two more golds to the country's medal haul.
The latest victories sweep the engaged couple's gold medal tally into double figures - with the pair now able to boast 10 between them.
Trott became the first British woman to claim four Olympic gold medals with her win in the Omnium, while Kenny equalled the British record haul of Sir Chris Hoy after winning his sixth Olympic gold by scooping the top title in the keirin.
The 28-year-old from Bolton dominated the track as he powered around the boards of the velodrome - claiming team GB's 19th Rio gold.
Trott cried on the sidelines as Kenny pedalled his victory lap with his arms in the air, before the couple embraced and kissed as the crowd cheered.
Speaking to the BBC following his win, Kenny said: "Today just felt like a dream really, I think I'm just kind of so tired I'm just floating through it. So yeah, I really enjoyed today."
He said it was "pretty mental" to have equalled Sir Chris' medal haul, adding that the 10 golds he and his fiance have amassed between them was "not bad".
"I was there in Beijing obviously when Chris won his three, and I knew at the time it was special, and then as the years have gone by I appreciated even more how special those Olympics were and how amazing Chris was then.
"So yeah, to come here and to do the same is amazing."
Sir Chris stood up and applauded Kenny's triumph, branding it a "special moment" during his BBC commentary.
He said: "When he came on the team just before Beijing back in 2008 we knew we had a very special addition to the team.
"But even with all the talent and potential that he had, I don't think we realised just how special this man was going to be.
"Phenomenal performance tonight, phenomenal performance all week - just amazing."
Genuinely delighted, Sir Chris added that Kenny "is a friend and you want to see your friends do well".
"He deserves this, he has earned it, he has worked hard."
An emotional Trott shared her excitement online tweeting: "Arghhhh!!!!!! I love him to bits @JasonKenny107 !! Our kids have to get some of these genes right?!"
Having successfully defending her title, Trott told the BBC: "I can't believe it - I did not expect that at all. I am just so happy that it all came together - I can't thank everyone at home enough."
The 24-year-old from Cheshunt added: "To be able to repeat my success in London - I can't explain what I am going through right now, I am so, so happy."
The gold success echoes that of Team GB's Giles Scott, who followed in the footsteps of sailing greats Iain Percy and Sir Ben Ainslie to win sailing's Finn class earlier on Tuesday.
The 29-year-old, who raised his fists in the air after crossing the finish, merely needing to complete Tuesday's race to top the podium after an eighth and second on Sunday made him uncatchable in the double-point finale.
Scott was the overwhelming favourite with bookmakers having failed to win just two regattas in this Olympic cycle, and Sir Ben's successor made light work of that pressure to continue Great Britain's 16-year golden Finn record in the Olympics, started by Percy at Sydney 2000.
He said: "It has been a huge luxury - there's not many times you can say you have won an Olympic Games before the medal race.
"We knew coming here to Rio that the racing wasn't going to be easy. Regardless of form, it was always going to be a hard week and it certainly was that.
"I had a particularly shaky start. I've managed to pull through some good consistency and, yeah, to win it the way I have, I couldn't ask for any other way."
Ireland also enjoyed success on the water, with Annalise Murphy securing the country's first Olympic sailing medal in 36 years after winning Laser Radial silver.
And British duo Hannah Mills and Saskia Clark are in a similarly comfortable position to Scott in their quest for Britain's second sailing gold, having built up a 20-point cushion ahead of Wednesday's 470 medal race.
Team GB enjoyed further medal success in the velodrome on day 11, as Wales' Becky James won silver in the women's sprint final while Katy Marchant, from Leeds, took bronze in the same event.
Success for Britain's Olympians continued into the night, with diver Jack Laugher claiming the silver medal after a gruelling six-round competition at the men's 3m springboard.
Despite struggling during the prelims and semi-finals, the 21-year-old from Harrogate brought his best to the final, achieving a total score of 523.85.
But it was not the best personal achievement for Laugher during this year's Games, having already bagged a gold medal for synchronised diving with his partner Chris Mears.
Earlier on Tuesday evening, gymnast Amy Tinkler added to Britain's trophy cabinet by taking bronze in the women's floor exercise final.
The 16-year-old from Bishop Auckland - team GB's youngest athlete - broke down in tears as she bagged third place with a score of 14.933.
She told BBC: "I just love competing in front of big crowds, it's just incredible, I'm just so shocked."
Asked about when she will receive her GCSE results she joked: "I get them the day I get home from Rio so I've got that look forward to now."
Less than an hour later, Nile Wilson won bronze in the men's high-bar final - a first for Team GB in the event.
The 20-year-old from Pudsey punched the air with both fists as he landed his routine, which earned him a score of 15.466.
Boxer Joshua Buatsi claimed a bronze medal in the men's light-heavyweight category after a semi-final defeat to Adilbek Niyazymbetov of Kazakhstan.