Celebs Tweet Condolences to Vanessa Hudgens as She Prepares for 'Grease: Live!' Following Father's Death

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It's not an easy day for Vanessa Hudgens.

The 27-year-old actress geared up to play Rizzo in FOX's highly-anticipated live musical production of Grease: Live! on Sunday amidst the tragic news that her father, Greg Hudgens, died one night earlier after a battle with cancer.

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Upon hearing the news -- which Vanessa announced over Twitter just hours before she was set to take the stage -- her High School Musical co-stars took to social media to share their condolences.

"I am devastated," Ashley Tisdale, who starred as Sharpay in the 2006 Disney musical drama, wrote. "Just thinking of my girl and praying for her strength today."

She also posted a lengthier message on Instagram, encouraging her fans to tune in and send prayers.

Monique Coleman was one of the first celebrities to share her support for Vanessa and her younger sister, 20-year-old Stella Hudgens, writing, "My deepest condolences @VanessaHudgens @stellahudgens. I love you both so much! You're in my thoughts & prayers."

Hudgens' Spring Breakers co-star Ashley Benson and Sucker Punch co-star Jamie Chung also rallied around her, both tweeting their love and support.

As ET previously reported, Vanessa asked her followers to pray for her dad's healing over Instagram last July, announcing one month later that he was sick with stage 4 cancer at the Industry Dance Awards in Los Angeles. The news came less than one year after her boyfriend, Arrow star Austin Butler, lost his mother to cancer in September 2014. No other details about Greg's death at age 65 have been given yet.

WATCH: Vanessa Hudgens Reveals Her Father Has Stage 4 Cancer

In addition to her former co-stars, many other celebrities, friends and fans also took to social media to send prayers to the Hudgens family and wish Vanessa good luck in the production, which airs on FOX at 7 p.m. ET.

After Vanessa's amazing performance in Grease: Live, Butler and Tisdale took to Twitter again to praise and congratulate her on her flawless turn as Rizzo.

WATCH: Vanessa Hudgens' Father Greg Dies of Cancer