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Jen Arnold of The Little Couple Celebrates Final Chemo Treatment

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Justin Coit

Last year brought both extreme highs and extreme lows to Dr. Jennifer Arnold and her husband, Bill Klein, of TLC’s hit reality show The Little Couple.

Their dreams of becoming parents finally came true when they adopted son Will, 3, from China, and daughter Zoey, 2, from India. But then, Arnold, 39, a neonatologist at Texas Children’s Hospital, received the devastating news she had a rare form of cancer, which she fought to bring into remission.

The family celebrated Arnold’s final chemo treatment in the hospital with cupcakes all around, shown in an exclusive sneak peek of this week’s episode of The Little Couple that will air Tuesday, April 8 at 10 p.m.

“It’s a red-letter day in history for Will, not because Jen’s treatment is done, but because he had cake before noon,” Klein says in the episode.

Both Klein and Arnold say they are now looking forward to life getting back to normal at their house, enjoying their two toddlers and putting her treatment behind them.

RELATED: Inside The Little Couple‘s Busy Life with Toddlers