Wishing Jen the best! After revealing in early December that she is battling cancer, TLC star Jen Arnold has been updating fans on her progress.

The 39-year-old star of The Little Couple wrote late Thursday, Dec. 26, using her hashtag #GetWellJen, "Good news is my counts are improved and am getting chemotherapy today!"

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Arnold, who was diagnosed with a rare type of cancer, told Us Weekly in a statement in December that she had been undergoing treatment, including surgery and chemotherapy. "I am very fortunate as the prognosis is very good," the neonatologist told Us.

The mother of two -- to adopted son Will, 3, and daughter Zoey, 2, with husband Bill Klein, 38 -- added in the statement, "While there is never a good time to get news like this; getting it just as we are building our new family is tough in many ways . . . but being surrounded by the love of my husband and our two beautiful children is actually in many ways giving me the strength to fight it even stronger."

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Staying true to her mantra of strength, Arnold posted images of herself celebrating the holidays with her family. She updated fans on Friday morning, "Day2 inpatient chemo- sleeping alot, liking new anti nausea med this time, & looking to get home today!" -- along with a photo of herself in the hospital, without hair, smiling for fans.

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The reality star has maintained a brave and positive attitude through her health scare. Just three days before Christmas, she wrote, "Cancelled chemo= feeling better for holiday= energy for baking Christmas cookies with kids & @ReallyBillKlein- Life doesn't get much better!" Her husband has also been expressing support for wife as she continues fighting through cancer.

TLC told Us that the network will document Arnold's battle with cancer. "TLC has chronicled Bill and Jen's lives since 2009 and at their request, we will be following them through this challenge. Jen is a doctor and teacher and she saw this as an opportunity to educate and possibly help, through sharing her story."

Fans are asked to send their regards to Arnold on Twitter using the #GetWellJen hashtag.

This article originally appeared on Usmagazine.com: Jen Arnold, Star of TLC's The Little Couple, Tweets About Chemotherapy