The X Factor supremo and his girlfriend of six years ended their relationship six weeks ago.
But according to American magazine Life & Style Cowell gave Seymour $5m in cash, in addition to a $4.6m mansion in Beverly Hills as a parting gift.
Terri now owns the luxury Los Angeles apartment that Cowell, who is worth Ј130million, bought for her when she moved out of their shared home this summer.
It features four bedrooms, three bathrooms and an impressive view.
'Simon thinks the world of Terri, and that isn't going to change. He also understands her reason for ending it,' a source told the magazine.
Seymour wanted to marry and start a family, whereas Cowell recently said: 'I don't want to marry anyone, because whoever marries me will end up hating me.'
The stunning 34-year-old TV presenter is now believed to be dating 35-year-old Hollywood actor Stephen Dorff, whom she met in September.
Cowell, who is one of TV’s highest-paid stars, has given her new love his blessing and has privately said he is delighted to be free of the relationship.
'Simon has basically been waiting for Terri to announce the relationship is over for months,' a friend revealed.