Laura Trott kisses her women's omnium Olympic gold medal [Andy Stenning/NOPP]

WELWYN cyclist Laura Trott is a double Olympic champion after winning gold in the omnium this evening (Tuesday).

Laura Trott celebrates winning the women's Olympic omnium time trial [Picture: Richard Pelham/NOPP]

The 20-year-old Team GB star pipped American rider Sarah Hammer in a nail-biting climax to the six-event omnium at the London Velodrome.

Trailing by two points entering the sixth and final discipline, the 500m time trial, reigning world champion Trott set the fastest time to win the event.

And her main rival from the United States, Hammer, could only finish fourth on the clock, meaning Trott took the Olympic title by just one point.

The pair competed against each other in the final time trial heat, with the pressure on the Welwyn Wheelers honorary member.

Laura Trott shows off her Olympic gold medal at the women's omnium victory ceremony [Picture: Andy Stenning/NOPP]

Watched by her father Adrian Trott and sister Emma Trott, GB’s new golden girl recorded a blistering first lap to open up a huge lead over Hammer and the result of the race was never in doubt.

However, Laura still needed Hammer to finish down the overall field to take the Olympic gold. The American’s time put her fourth, giving Trott the gold.

A modest Laura, who was cheered on by Prince Harry, said: “I cannot believe this is happening to me. My coaches really helped me to peak on time. I am so happy.”

After the Hertfordshire rider was crowned champion, Tour de France winner and Olympic time trial gold medallist Bradley Wiggins tweeted: “Dame Laura Trott!!!!!”

Meanwhile, comedian John Bishop tweeted: “2 gold medals from a Trott and no horse”.

He later added: “Laura Trott – what a genuinely lovely girl. Its like we all just had a little sister win.”

Laura’s jubilant sibling, Emma, tweeted: “So @LauraTrott31 has made me one very proud sister again!”

There were also huge cheers at Laura’s home track at the Gosling Sports Park, in Welwyn Garden City, as she crossed the finish line to claim her second gold medal at her first Olympics.

The petite Laura won the Olympic women’s team pursuit on Saturday with her ‘cycling sisters’ Joanna Rowsell and Dani King.

And Roswell tweeted: “@LauraTrott31 you absolute legend!!! On my way to the velodrome now to give you a massive hug! :D X”

On another amazing evening for British cycling, Sir Chris Hoy won the men’s keirin event, while Victoria Pendleton took silver in the women’s sprint.