Sources tell TMZ that Sienna Miller is on to her next leading man, James Franco. The two are currently filming “Camille,” a movie about two honeymooners’ road trip to Niagara Falls. The pair were spotted this weekend in Toronto getting cozy after-hours.

During filming Friday afternoon, the leading pair had to roll around the hay kissing as Franco’s shirt was off. Once the set wrapped, sources say the couple took the on-set frolicking off-set, well into the evening. The two took in a concert and were seen canoodling and dancing in the streets together. Around midnight, Miller and Franco got some Chinese food, enjoyed a cigarette together and hit the nightclubs.