The 18-rated movie doesn't arrive in cinemas until Valentine's Day but it seems Kim used her star power to bag a secret preview screening of the hugely anticipated flick.
Ah, the benefits of celebrity!
Kim tweeted: "Girls' night watching a private screening of Fifty Shades of Grey!!!!! OMG it's soooooo good!!!!!"
Based on the erotic novel by E.L. James, the movie documents the relationship between dominant businessman Christian and the naïve student Ana: a relationship that begins with a BDSM contractual agreement.
The film has been heavily guarded and shrouded in secrecy with even director Sam Taylor-Johnson admitting last month her own husband hadn't seen it yet!
Two full scenes were released this week, however. One showing Ana and Christian's first meeting and another the moment Christian surprises Ana at work.
Northern Irish actor Jamie Dornan plays the brooding Christian, while Dakota Johnson – daughter of Melanie Griffith – is wide-eyed Ana Steele.
Another famous face in the movie is Rita Ora, who is making her major feature film debut as Mia, the younger sister of Christian.
As well as boasting a sizzling cast, the movie's got an a-mazing soundtrack featuring the likes of Beyoncé, Jessie Ware and Ellie Goulding, who recorded track 'Love Me Like You Do' especially for the movie.
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