The 'Bad Boys' singer had been scheduled to head out to the Big Apple for a performance with Greek tenor Mario Frangoulis tonight and tomorrow.
This morning, former X Factor winner Alex made it all the way to the airport before realising that she didn't have her most important travel document!
But it seems like Alex's passport was back in her hands in no time at all, after telling fans on Twitter that it had been left on her bed.
Posting a photo to Instagram, she said: "Missed my flight to NYC this morning! Sooo I've finally got my passport (left it on my bed duhh) and now I've a bag of my favourite popcorn! Can't cry about! Just have to get on with it! I will make the show tonight with Mario! In Jesus name amen! #Terminal4 ... #AlliWant2DoIsSleep."
Last night, 25-year-old Alex, who is training to be a life coach, turned heads in a patterned white fishtail gown as she joined celebrities at the Helping Hands Dinner in aid of the WellChild charity in London.
Alex later switched into a stunning red embroidered dress for her performance. Posting a photo on Instagram, she said: "Such an honour to perform for this charity! What a fantastic night!!"
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Watch Alex's music video for 'Bad Boys' below: