Los Angeles, March 1 : Actress Kirsten Dunst says she has set a time frame for her forthcoming marriage to fiance Jesse Plemons.

Dunst and her "Fargo" co-star announced they were engaged in January. The couple has remained tight-lipped about the actual date they have set for wedding.

"We have a time frame, but that's private," Dunst told etonline.com when asked about her wedding date.

Asked how she knew he was the one, Dunst added: "I'm happy. You just do. You do!"

The couple were first spotted kissing in May last year as they enjoyed a day out in Studio City, California just a month after Dunst split from her "On The Road" co-star Garrett Hedlund after four years of dating.