The One Show presenter said 'I do' to fiancé Charlie, an insurance broker from New Zealand and partner of three years.
The couple were surrounded by friends and family in a dream venue - a castle in Cardiff.
Alex and Charlie announced their engagement last February on TV, after Chris Evans first mentioned it by accident on his radio show.
The couple announced their engagement on The One Show
On ITV's Lorraine, the bride-to-be had said that she wanted her special day to be intimate: 'It'll be just with our close friends and family and a day when everybody can have a bit of a laugh. I think everybody turns up, there'll be some wine and it'll be a nice day.'
The TV veteran told fitness magazine Fit & Well in July that she had a set date, but wouldn't give any more details away.
'Charlie and I aren't that organised, so my mum's doing a lot of the planning. We have set a date and we're looking at venues in Wales.'
In the interview, the 38-year-old seemed to have found her soulmate, as she spoke of how Charlie and her both share the same priorities in life.
'Friends and family are important to me and Charlie. We've been bought up in similar ways and have the same morals about things, which is important. Our mums are very similar. When I first went to visit Charlie's parents in New Zealand for the first time, I saw his mum at the airport and from a distance she looked like mine. They even have the same sofa!'
Although the couple seem over the moon now, their relationship wasn't always easy. Before announcing the engagement, Alex shared how their romance started with the uncertainty of whether Charlie would return to his native country.
'The problem is he's from New Zealand and had been living in the UK, but [he] was planning to go back home when we met. It's still an unresolved issue as to whether he will stay permanently. It's a big thing to ask him to give up his family and home for good.'
Looks like Charlie has made his decision - congratulations to the happy couple!