Sussanne, who raises two children with Hrithik, separated from the actor in 2014.
The interior designer had maintained silence over the controversy that has been making headlines for past two months but she finally took to Twitter to defend Hrithik.
"pictures are photoshopped and untrue stories carry 2 much weight.Another pic for d rec. I support @iHrithik in this (sic)," Sussanne wrote alongside a picture where she and the actor are embracing each other at the same party.
Kangana is set to record her statement as a witness in the alleged imposter case, filed by Hrithik, this Saturday.
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29-year-old Kangana and Hrithik, 42, have been at loggerheads since the "Queen" star purportedly referred to the actor as the 'silly ex' in an interview.
Hrithik, who was the first to send the legal notice to Kangana, has demanded that she apologise publicly and clear the air about their alleged affair which he firmly refutes.
Kangana has slapped a counter-notice to the actor alleging him of 'slut-shaming' her by circulating private mails and photos that she sent to him. Kangana maintains that they had an affair.
He also claims that when he got to know about the imposter during a Bollywood party, he gave Kangana his email id but she bombarded him with messages, photos and videos, declaring her love.