The 73-year-old former James Bond actor and journalist arrived arm in arm for an elegant birthday dinner.
Keely looked stylish in a black dress and matching blazer, accessorised with a striking pearl necklace and elegant ballet pumps.
Pierce, who stars in MobLand, cut a youthful figure in a blue linen suit and fashionable sunglasses.
The couple, who have been married for 25 years, were joined for the family celebration by their two sons, Dylan, 29, and 25-year-old Paris.
Keely previously told People that she was immediately captivated when she met the Bond star, recalling the 'mischievous sparkle in his eyes'.
In the same interview, Pierce praised his wife, saying: 'I found a great woman in Keely Shaye. Not if I searched a million times over would I find one as good.'
Pierce Brosnan and his wife Keely Shaye Smith looked deeply in love as they headed out in Los Angeles to celebrate her 63rd birthday yesterday
The former James Bond star, 73, and the journalist have been married for 25 years
Last year, Pierce said Keely still makes his 'world turn' during an interview with Fox News: 'She still makes my heart sing and she still makes my world turn.
'She allows me to go out into the world and create what I do as an actor, and that takes strength and stamina. We just enjoy each other's company.'
In January, fans rallied around Keely after a cruel troll posted comparison photographs of her as a supposed 'reminder to avoid marriage'.
The couple are widely regarded as one of Hollywood's enduring love stories. However, a user on X claimed their relationship suggested marriage should be 'avoided'.
The post featured images of the couple on the red carpet at the Governors Ball for the 1996 Academy Awards, alongside a photograph of them at the Mamma Mia! premiere in 2008.
Many users responded with messages defending Keely and the couple's relationship. One wrote: 'I don't get some men on X devotion to degrade Brosnan's wife. They're both happy, aging gracefully, and she was and is absolutely gorgeous.'
Keely wore a black dress and blazer, finishing the look with a large pearl necklace and chic ballet pumps
Pierce looked dapper in a blue linen suit and fashionable glasses
Their 29-year-old son Dylan also joined the family gathering
Paris cut a stylish figure in a white shirt and black trousers as he left the venue
Another fan said Pierce had 'won the lottery of life', writing: 'Pierce Brosnan’s won the lottery of life. Dude’s been married 30 years and they’ve both aged gracefully.'
Further messages from fans read: 'Agreed. If you're this shallow and stupid, you should avoid marriage at all costs. Sincerely, women everywhere...
'She is such a beautiful woman. How lucky they are to share that bond over so many years. Beautiful... Marriage is beautiful when you're with the right person... he seems happy. they are lucky... This is unacceptable...
'Why? They are happy and value one another ? I don’t see what you’re getting at here ?... You couldn't pick the worst example. First, she's beautiful in both pictures and second they are glowing with organic happiness...'
Pierce was previously married to wife Cassandra Harris for 11 years but she died of cancer in 1991.
They had one son together, Sean, and Pierce also adopted her two children from a previous marriage, Charlotte and Christopher.
