Holly Willoughby, Emma Bunton and Vogue Williams ensured St. Patrick's Day got off to a promising start on Tuesday by honouring the patron saint of Ireland in a series of social media posts.
Former This Morning presenter Willoughby was among the first to share a message after meeting friends for a boozy pub lunch at legendary London watering hole the Devonshire Arms.
Taking to Instagram, the TV personality, 45, filmed herself toasting the annual celebration with a pint of the Guinness while occupying a table at the popular Soho venue.
Sharing her own St. Patrick's Day message, Bunton, 50 - who has close family ties in southeast Ireland - shared photos of herself wearing a Wexford football shirt while raising a can of the black stuff.
'Happy St Patrick's Day!' she wrote. 'Wishing a brilliant day to everyone celebrating, and a special shout to my family and friends back home in beautiful Wexford!'
Elsewhere, Williams confirmed she had returned to Ireland from the London home she shares with husband Spencer Matthews and their children ahead of Dublin's annual St. Patrick's Day parade, during which she will serve as Grand Marshal.
Former This Morning presenter Holly Willoughby was among the first celebrities to share a St. Patrick Day's message after meeting friends for a boozy pub lunch at the Devonshire Arms.
The presenter previously said she was excited to be involved in the Dublin St Patrick's Day parade, which drew thousands of visitors to the streets of the Irish capital.
Parades are being held in Dublin, Belfast, and Cork, while in actress Jessie Buckley's native Killarney they are marking her Oscars win with a float dedicated to successful people from the County Kerry town.
Families and tourists thronged the streets in cities and towns across the Ireland for St. Patrick's Day, while reflecting on what it means to be Irish.
Before the parade in Belfast began, thousands of people took part in the 10km race through the city's streets.
In Dublin, children and visitors gathered hours before the parade began to get a good glimpse of it - wearing tricolour glasses, leprechaun hats, decorative green face glitter and clusters of shamrocks.
The Irish capital's parade - comprising 12 large floats and more than 3,000 participants - ran from Parnell Square in the north of the city down Dublin's main thoroughfare O'Connell Street and ends at the Cuffe Street/Kevin Street junction on the south side of the city.
Performers in the parade included Macnas, Bui Bolg, Spraoi, the Inishowen Carnival Group, and The Outing Queer Arts Collective.
The Rotunda Hospital, located near the start of the parade, has its first float of the parade, designed by ArtFX.
Eleven-year-old Dubliner Rian Doyle said that St Patrick's Day was about celebrating Irish achievements, while Karen Van Brakel from Holland said it was about the Irish value of bringing people together.
Two school friends from the Philippines, Anna May and Primrose, were dressed in green T-shirts and sparkly shamrock face paint.
Bunton - who has close family ties in southeast Ireland - shared photos of herself wearing a Wexford football shirt
Vogue Williams confirmed she had returned to Ireland ahead of Dublin's annual St. Patrick's Day parade, during which she served as Grand Marshal
Taking to Instagram on Tuesday, Williams shared a photo from the window of her plane as it flew over her family home in Ireland
Anna May said it was her first St Patrick's Day parade, while Primrose, who is an Irish citizen, has been to many.
'This is my first time seeing a big parade, so I would like to experience the culture of Ireland, plus I think St Patrick is one of the most famous festivals,' Anna May said.
'We're Catholic as well,' Primrose said.
Jessica McGuinness, from Finglas, brought her three-year-old son Jack for a Shamrock shake before going to the front spot near Parnell Street.
'He loves the marching bands and the flags,' she said.
Rian Doyle said he and his sister Kelly, nine, have been to the Dublin parade for several years, and said he likes the fun of the singing, dancing and marching.
'It's a religious tradition,' he added 'but also to celebrate Ireland and all we've done over the years.'
The theme of the Dublin parade was a celebration of people and roots, featuring marching bands from Scotland and eight from the US: Ohio, Arizona, Illinois, Wisconsin, Iowa, Mississippi, Indiana and Texas.