The Parenthod star and Maness got engaged in November 2014, which the actress announced through a sweet photo on Instagram.
"Thanks for all the well-wishes! It's official," she wrote alongside a snap of the pair kissing. "We're engaged."
While the couple has kept quiet on their relationship and wedding plans, the actress has shared plenty of cute pictures of their adventures on Instagram throughout their romance. Earlier this summer, Christensen, 33, posted a shot of herself riding on the back of Maness's bike while in New York City. She also shared a shot during a visit to an aquarium in Atlanta.
Christensen is perhaps best known for playing Julia Braverman-Graham on Parenthood, which ended its five year run earlier this year. Next up she'll appear in Confirmation, an HBO TV movie about Anita Hill (played by Kerry Washington) and ABC's new series Wicked City, which also stars Gossip Girl's Ed Westwick.