"The Transformers: Dark of the Moon" star was picked to present Project Runway All Stars but backed out just weeks before filming began last month, reported the New York Post.
"Literally days before filming, the show suddenly had no host. Rosie had been pushing really hard for the job. She'd charmed everyone. But then with less than three weeks to go, Rosie pulled out to do Mad Max, creating a huge drama," a source said.
Model Carolyn Murphy was eventually given the job hosting the show and guest stars have already included Kylie Minogue and Katie Holmes, who fulfilled her commitment despite going public with her divorce news just days before.
"Everyone expected Katie to cancel, but she didn't. She's friendly and professional but didn't say a word about her divorce," the source added.