Emma confirmed their family was safe in a video message and thanked those who had sent them “kind words” of support and asked for prayers for those in Los Angeles and for the firefighters.
Alongside a video of the fires raging on the streets, she wrote on Instagram: “The hurricane-force winds and lack of water have meant the fire has spread catastrophically fast and taken much of our beloved area with it. Schools, homes, shops, and stables are all gone.
“We woke up to helicopters, thick black smoke, winds howling, and the uncertainty that our house would survive.”
This Is Us actress Mandy Moore revealed that every home on her street in Altadena, a region in Los Angeles County, had been destroyed and that parts of her property had been lost.
Alongside photos of a structure reduced to files of ashes, she wrote: “Miraculously, the main part of our house is still standing. For now. It’s not livable but mostly intact.
“We lost Taylor and Griffin’s studio with every instrument and piece of equipment they’ve ever owned. We lost our garage and back house.
“Everyone we know lost everything. Every house on our street is gone. My in laws. My brother and sister in law – six weeks from welcoming their first baby. Our best friends.”
Moore said she was feeling “weird survivors’ guilt” but they would do “everything” they could to “help rebuild and support” their community.
Coronation Street actress Sally Dynevor revealed she was due to fly to Los Angeles on Thursday as she sent her support, writing: “Thinking of everyone involved and the emergency services working tirelessly. Praying for this to end.”
Boyzone singer Ronan Keating sent his “love and hope to everyone in LA” while fellow Irish singers Jedward said: “Our thoughts and prayers are with our LA friends”.
Broadcaster Piers Morgan said he was “heartbroken by the horrific fires” raging through Los Angeles which had affected many of his friends.
He added: “Am obviously concerned about my own house in Beverly Hills, as the fires get worryingly closer, but right now my thoughts, prayers and heartfelt sympathy are with all those who’ve already suffered terrible loss.
“And with all the heroic firefighters working so hard, at great personal risk, to tackle this horrendous disaster.”
English actress Patsy Palmer said her “heart is broken” and “brain is fried” watching the destruction after she left Los Angeles for work in the UK over the weekend.
“My family are safe but lots of my friends have lost their homes again which is extremely traumatic,” she added in an Instagram post alongside a photo of the blazing fires.
“Being here so far away is really, really hard. I’m praying and crying as I write this. I’m helpless here but praying hard.”
