They were seen re-shooting parts of Fifty Shades Of Grey last week, with less than four months to go before the erotic flick gets its cinematic release.
And now it seems that rather than merely perfecting a couple of scenes, producers had Dakota Johnson and Jamie Dornan back on set re-enacting their steamy encounters due to a concerning absence of heat between the duo.
A film source has revealed to Us Magazine that the footage didn't feel "passionate" and producers have been disappointed by the lack of chemistry.
"Dakota isn't coming off sexy enough," said a second source. "Ana needs to be naive, not a dish-rag."
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A Universal rep denied the lack of chemistry and said: 'No one should question the heat or intensity of our actors.'
The cast are determined to get it right however, with another insider adding: 'They want to do sequels, so this has to be perfect.'
Last week the actors were seen in woods near Vancouver to do-over some of those raunchy scenes.
Irishman Jamie, 32, got into character as millionaire entrepreneur Christian Grey in a black leather jacket and jeans.
Dakota, 25, as his onscreen lover Anastasia Steele wore a brown leather jacket, T-shirt and trousers.
The duo looked tense during their encounter but ended up kissing passionately by a park bench.
Meanwhile Dakota - who is the daughter of Melanie Griffith and Don Johnson - attended the CFDA Vogue Fashion Fund event in Hollywood on Tuesday.
The Social Network star looked stunning in a striking semi-sheer dress with floral embellishment during a memorable appearance at the soiree, which showcased fashion lines from five promising young designers.
The actress added to an already bold look with a pair of strappy gold heels, while a matching handbag and Wayfarer sunglasses rounded things off.
Dakota has been romancing Drowners frontman Matthew Hitt for three months.
And Marie Antoinette star Jamie was spotted arriving in Canada last week with his 11-month-old daughter and real-life love, British actress Amelia Warner.
Jamie wasn't the first choice to take on the role as Christian Grey. He joined the production after original choice Sons Of Anarchy star Charlie Hunnam suddenly stepped down after clashing work commitments.
Based on E. L. James' hit 2011 novel, Fifty Shades of Grey will be released February 13.
Marcia Gay Harden, Rita Ora, Jennifer Ehle, and Luke Grimes will also have roles in the highly-anticipated drama.
- Daily Mail