She was said to be 'so happy' when boyfriend Taylor Goldsmith proposed, on Tuesday morning.
And Mandy Moore couldn't hide her delight when she flashed the new 'understated' engagement ring later that afternoon.
Seen grinning from ear-to-ear, the stunning actress, 33, met with family no doubt in celebration of her new, happy wedding news.
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Happy news: Mandy Moore flashed her new engagement ring on Tuesday, following a proposal from boyfriend Taylor Goldsmith that morning
Goldsmith is said to have popped the question only hours before at the couple's home in Los Angeles.
Fresh from the news, a giddy Mandy was seen heading out to share the news with friends and family over lunch.
She waved her left hand, on which she now wore a silver ring with a simple stone at the centre.
The Dawes frontman chose the 'understated' because he found it to be 'very Mandy,' insiders reveal.
Oh hey! Mandy waved with her left hand, brandishing the new accessory as she approached friends
Happy news: Mandy was marking the moment with friends, just hours after her proposal, it's believed
'So happy': Mandy was said to have been delighted with the proposal
The look was a classic accompaniment to a business-style checkered blazer and chic sunglasses.
To the casual image, Mandy wore ripped jeans and a simple T-shirt.
It was the This Is Us star's friend, entertainment journalist Marc Malkin, who shared Mandy's happy news on Facebook on Wednesday.
Goldsmith popped the question on Tuesday at the couple's home in Los Angeles, it was claimed.
'He was petrified. Mandy said yes and is so happy,' a source told the reporter. 'She's so in love with Taylor.'
It's real: Mandy and her partner have been together for two years
The stars have been dating for two years.
'She's one of the nicest and most genuine people in Hollywood. Such awesome news,' Malkin, who used to work for E! News, also said.
This news comes just as Mandy, 33, is about to head to the Emmy Awards on Sunday where her show This Is Us is nominated 11 times.
Before she started dating Taylor, 32, Mandy was married to Ryan Adams, 42, from 2009 until 2016.
The Princess Diaries star had dropped proposal hints in July to People magazine.
With pals: Moore and Goldsmith (left) alongside Susan Kelechi Watson, Jennifer Salke, President, NBC Entertainment, and Ben Feldman in January
The ex: Mandy was married to Ryan Adams from 2009 until 2016
'I would definitely get married again,' the former teen star said.
'My life has sort of taken unexpected twists and turns professionally and personally, but overall my journey is the reason I am here today and I feel fulfilled by everything that happened.'
'I’m definitely ready for motherhood sooner rather than later!' Mandy revealed. 'I think that’s going to be the next chapter.'
On Tuesday, the actress reportedly celebrated the