Demi Moore's oldest daughter Rumer Willis appeared distraught as made her way to visit her mom on Wednesday.

After Moore was admitted to the hospital for "substance abuse" issues, the 23-year-old was the first family member spotted at the hospital, frequently ducking outside for a smoke break, and looking visibly shaken as she chatted on her cellphone.

Sources close to Willis say she's been worried about her famous mom for weeks and was even concerned enough to reach out to estranged husband Ashton Kutcher, who is currently in Brazil for fashion week and a catalog shoot.

"Rumer is devastated. She worries day and night about her mother and has been watching her mom fall apart. Rumer actually reached out to Ashton on several occasions and he just blew her off. He either wouldn’t answer or he’d say he’d help but nothing would happen," a source tells

On Jan. 11, Moore was seen partying it up at The Roosevelt Hotel in Hollywood with Rumer, and hitting on a much younger man, 27-year-old 90210 star Ryan Rottman.

"[Moore] found ways to touch him all night, and at one point when he was in front of her, she was grinding on his butt," the source told People, "His shirt came unbuttoned, and she started tickling his bare chest playfully. She seemed really happy to be out with her daughter's friends." Rumer was reportedly infuriated and embarrassed at the scene.

Reports have claimed Demi was hospitalized for anorexia, exhaustion, stress, a seizure and even an overdose of nitrous oxide.