Kutcher split from his wife Demi Moore, who is Rumer's mum, last November (11) after six years of marriage, but that doesn't mean the actor has cut all ties with her three children with ex-husband Bruce Willis.
The star was spotted at The Sayers Club on Monday night checking out the singer's performance, according to TMZ.com.
Rumer has been in need of strong moral support as of late - her actress mum Moore, who was not present at the show, was hospitalised in January (12) after she was found semi-conscious at her Hollywood home. The Ghost beauty later spent two days at a medical facility for exhaustion and stress, and she reportedly completed more treatment in Utah last week (begs27Feb12) before heading off for a short vacation in Turks and Caicos.
Moore returned home to California on Sunday (04Mar12).