The 'Beverly Hills 90210' actress announced in March that she and her 'Twilight Saga' star husband Peter were splitting after 11 years of marriage and while she is also dating, Jennie revealed seeing Peter and Jaimie Alexander together hurts.
She told People magazine: ''I think there will come a time when it won't sting so bad. But I'm not quite there yet.
''You know, I am happy that he is happy, though.
''I'm dating one guy right now.''
Jennie, 40, and Peter have remained friendly for the sake of their three daughters, Luca, 15 Lola, nine, and Fiona, five, and Jennie revealed they have worked out an agreement for sharing custody over the festive season.
She added: ''We are co-parenting and getting the hang of it.
''We will celebrate really quietly at home this year and then travel to see a friend in Virginia. Then their dad is picking them up and taking them skiing, so they have a lot of exciting things going on.''