It was released on September 18, 2011, under label Polydor Records as the second single from Roberts debut album Cinderella's Eyes.

[2] Roberts unveiled the track as the second single on her website, declaring "it's very different to Beat Of My Drum" because it was important to show multiple sides to the Cinderella's Eyes album.

"[5] She stated that when it came to the production of the track she wanted to produce a "more downbeat dance record" noting it was what she was into at that point.

[7] Roberts' voice has been described by Katherine St Asaph of Pop Dust as a "springy" vibrato, with breathy background vocals featuring sounds effect including repeated kissing noises.

[2] Roberts discussed the track on her blog, commenting that its lyrical content alludes to a boy that initially does not share the same feelings as his partner, "but in the end you win him over and it's your lucky day.

[9] The 90s-themed concept incorporates house music, with "chunky" beats and "twinkly" synths to the original instrumental of the song.

Imagine living your life knowing that at any point you might be CRUSHED BY THE WEIGHT OF YOUR OWN AMAZINGNESS", noting that the band Dragonette was a large part behind the success of the track.

[10] Dan Lambden from the online magazine So So Gay found the song to be a "perfect medium between classic pop lyrics" and "a pulsating dance beat", and positively commented on the riffs within the track stating they would "satisfy the most Hoxton of hipsters".

[11] Emily Mackay from NME declared "I'd be a bit freaked out by a phonecall like that" in response to the lyrics "I’d like a phone call/I’d like to hear something like this—WAHWAHWAHWAH".

"[12] Despite listing "Lucky Day" as one of the singles of the week, Alex Macpherson of Metro gave a predominantly negative review noting "She’s lionised by a cult fan base, but wider appeal remains elusive" and further explaining that "her voice is simultaneously too weak and shrill to carry".

As the title changes color, Roberts walks and skips down a New York City street wearing a floral T-shirt dress.

Effects are placed on Roberts' with sperm cells graffitied on it shadow her movement with neon colors and throughout becomes increasingly prominent, and during the second verse Roberts performs a short dance movement with two back-up dancers before she walks past a wall with sperm graffitied on it, which also changes to multiple neon colours.

magazine responded well whilst noting her unusually short dress in the video, they said "we can't help but feel upbeat and summery when watching the star bounce about for single Lucky Day.

"[13] Aaron Spencer-Charles of Metro gave a mixed review, whilst describing the video, he ended with "and that's it really.