After a challenging year, Teresa Giudice celebrated her 44th birthday on Wednesday, and the reality star spent most of her special day working.

A source tells ET Teresa was filming scenes for the new season of Real Housewives of New Jersey on her b-day, but that didn't keep her from having a good time when her co-stars and family threw an impromptu celebration after they wrapped for the day.

WATCH: Teresa Giudice Speaks Out for First Time Since Prison: 'It's Going to Be a Great 2016!'

Teresa posed with her sister-in-law, Melissa Gorga, who posted a sweet pic to Instagram, writing in the caption, 'Spending the Day with the Birthday Girl! Love U."

Melissa also shared a cute snapshot of them having some fun splashing around by the pool.

WATCH: Teresa Giudice Celebrates Christmas With Melissa and Joe Gorga Following Prison Stint

Teresa shared some heartwarming family photos from her b-day dinner -- which a source tells ET was a low-key affair that included a special cake -- where she celebrated with her four "beautiful girls," daughters Gia, Gabriella, Milania, and Audriana.

WATCH: Teresa Giudice Reveals How Filming 'Real Housewives' Will Fit Into Her Life

She also shared a smiling selfie with her "beautiful Mamma."

Absent from the festivities, of course, was the reality star’s husband, Joe Giudice, who left home in March to serve a 41-month prison sentence, just three months after Teresa's 10-month stint behind bars came to a close.

WATCH: Teresa Giudice Visits Husband Joe in Jail for First Time

ET spoke with the couple just days before Joe's departure where they opened up how they going to cope with being apart yet again. "As long as I have my four healthy beautiful daughters and healthy husband and I am happy," Teresa shared. "That's all that matters." Check out the video below to hear more.