Paralympic sweetheart Ellie Simmonds smashed her world record to win a second gold medal last night – declaring "I'm just so chuffed".

Just 48 hours after winning her first gold, the teenager took the title in the 200m individual medley.

And while there were tears after her first medal, this time there was just her trademark beaming smile. The 17-year-old said: "I'm just so pleased – another world record. I'm just so chuffed."

It was a case of double delight for ParalympicsGB, as compatriot Natalie Jones won bronze in the same event Jones, 27, who has cerebral palsy, said: "I'm delighted to have a medal and can't believe it was so flippin' close."

Simmonds broke her own world record – which she set in the qualifiers – to take gold number two.

The win – just two days after she won gold in the 400m freestyle – makes her the third Paralympian to taste double gold success alongside cyclist Sarah Storey and equestrian Natasha Baker.

The race was attended by Prime Minister David Cameron, who took time out from organising his Cabinet re-shuffle to cheer on our Paralympic heroes.

Mr Cameron kissed beaming Simmonds on both cheeks and shook her hand as he presented her with the gold medal.

Simmonds, who has dwarfism, will be hoping to make it a stunning hat-trick of golds as she races in the 50m freestyle today.

Her family hailed her second gold medal in as many events – but insisted they had been relaxed about her race after a nail-biting night in the Aquatic Centre at the weekend.

Despite a dramatic last length that saw the teenage swimmer take the lead to beat the world record she set in her heat, the Simmonds family remained cool.

Saturday's race saw Simmonds beat Victoria Arlen by a five-second margin and snatch the world record from her rival.

Her sister Katie, 24, said: "This was a lot more relaxing than the other one. After this morning, we thought: 'Okay, we can relax'.

"The people sitting behind us saw our Team Simmonds badges, and were saying: 'How can you sit there so calm?'"

However, there was disappointment for equestrian star Lee Pearson, who won bronze at Greenwich Park.

Had he won the Grade Ib freestyle competition, the 38-year-old, from Staffordshire, would have joined Tanni Grey-Thompson and swimmer David Roberts with 11 Paralympic golds.

Organisers have hailed the superb start to the Games, which has now seen 101 world records broken in front of packed stadiums and unprecedented TV audiences.

The team is ahead of schedule in the quest for 103 medals, with 61 – including 18 golds as of yesterday evening.

Channel 4 announced the highest-ever TV Paralympics audience for Oscar Pistorius's controversial defeat in last night's T44 200m final.

A peak of 4.4 million tuned in to watch the 25-year-old South African, who went on to spark controversy by criticising the length of his rival Alan Oliveira's running blades.