The Rolling Stones frontman came under fire after he was spotted with a brunette ballet dancer over the summer, and reports suggested they met just weeks after Scott committed suicide at her New York home in March.
However, Jagger's former wife Hall has thrown her support behind him.
She tells Britain's Good Housekeeping magazine, "I didn't see any of that. He is single now and he can do what he likes. We are very, very friendly. We speak about the children, and we really get on well."
Hall, who has four children with Jagger, also insists the veteran rocker was devastated by Scott's death, and the family is "giving him a lot of love and support."
She adds, "It was very traumatic for the whole family. We all got on really well, peace was reigning. It was a shock for the whole family, and Mick was just devastated - it was a big shock for him."