Dec. 27, 2013 at 3:42 PM ET
Dr. Jen Arnold, who stars with husband Bill Klein on TLC's "The Little Couple," tweeted a photo of herself undergoing chemotherapy on Friday.
Earlier this month, Arnold revealed to People magazine that she has a rare form of cancer. She later said that the cancer, stage 3 choriocarcinoma, stemmed from a pregnancy loss. Arnold was in India with Klein adopting daughter Zoey, 2, when she experienced bleeding and flew home for treatment.
Arnold had earlier tweeted that she canceled a previous chemotherapy session for health reasons, which resulted in her having more strength for holiday activities with Klein, Zoey, and son Will, 3, who was adopted from China.
Arnold also posted a photo of Will enjoying his Christmas present of a karaoke machine, and promised that "Little Couple" viewers would get to meet Zoey soon.