The British girl group - consisting of Perrie Edwards, Jesy Nelson, Leigh-Anne Pinnock and Jade Thirlwall - rose to fame after winning series eight of The X Factor in 2011 and they can't quite get to terms with their record-breaking success in the States.
"It feels amazing," Jesy tells Reveal at Capital's Summertime Ball with Vodafone over the weekend (21 June). "We just feel like we're in a little bit of a bubble at the moment.
"We're taking everything as it comes but we're just working really hard and we just want to get to the top!"
In April, Little Mix confirmed plans for their first US headline tour, which will see them hit the road across the pond this September and October.
Little Mix, who supported Demi Lovato on the North American leg of her 'Neon Lights tour' earlier this year, also made chart history in 2013 by achieving the best-selling debut album by a British girl group in the States. The record was previously held by 90s pop group the Spice Girls.
"It's all very surreal," continues Leigh-Anne. "We can't quite believe what's going on and what's happening."
And where do the girls see themselves in the next five years?
"We want to sell out Madison Square Garden," Leigh-Anne tells us. "That's our aim, definitely."
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Watch Little Mix's video for 'Salute' below: