The announcement couldn't come at a more appropriate time — World Cancer Day.

The Little Couple star Dr. Jen Arnold announced she's beating the fight against a rare cancer she was diagnosed with last October, tweeting on Tuesday, "It's official- ME 1 vs CANCER 0... I WIN! Thank you for all the prayers, thoughts, & support!"

"What a wonderful way to celebrate #WorldCancerDay! I am done with cancer!"

After a failed pregnancy last Sept., Jen was diagnosed with stage 3 choriocarcinoma, a cancer brought on by the non-viable pregnancy.