Demi Moore's daughter Rumer Willis may have been with her mom when the actress had to be rushed to the hospital after she reportedly suffered convulsions due to "smoking something".

According to the emergency call made last Monday night, as paramedics neared Demi Moore's front gate, one of the people on the line with 911 could be heard shouting out the name 'Ru'.

"Hey, Ru... What's the name at the gate so that we can buzz them in from here?" the Daily Mail quoted a man on the phone as saying.

The call never reveals more about 'Ru's' identity, but it could be a reference to Moore's oldest daughter Rumer Willis.

Willis, 23, goes by that nickname and uses it on her Twitter account. She has most often been at her mother's side in the months since the actress's split from Ashton Kutcher, 33, after six years of marriage.

"Rumer's spent more time with her mom in the last few months than she has in a while," People.com quoted a source as saying.

A sombre Willis was seen earlier this week outside an LA-area hospital wearing a visitor's sticker. (ANI)