Fearne Cotton is pregnant with her second child.
The 33-year-old 'Celebrity Juice' panellist - who already has two-year-old son Rex with husband Jesse Wood - revealed the news in a statement on her website, although did not reveal when they are expecting the baby to be born.
She wrote: "Jesse and I are very happy to announce we are having another baby. I feel extremely blessed and happy that Rex will be a big brother, and we get to welcome another Wood into the world."
Along with the announcement, the BBC Radio 1 DJ confirmed she has decided to leave the station - on which she presents the 10am-1pm weekday show - after 10 years.
She continued: "It has also been a time of big decisions and one I want to share with you now. After much time and careful thought I have decided to leave Radio 1 after ten amazing years."
"I have had the most incredible decade broadcasting on Radio 1, meeting wonderful people, helping break artists and watching live music from the world's best."
The star - who married the son of Rolling Stones guitarist Ronnie Wood last July - added her departure from the station marks a "new chapter" in her life, and she will be leaving with positive memories.
She explained: "However it is now time for a new chapter.
"I would like to thank Radio 1 for being such a great home and most of all to the listeners who have been on this journey with me. It's such a kick to know you heard a band on my show first, or that the songs I've played have helped you through the day, so thank you.
"I will leave with the best memories and many great friends.
"Here's to family and new adventures."
Replacing the blonde beauty on her weekday show will be current Official Charts Show host Clara Amfo, who said she is "thrilled" to have secured the slot.
She said: "I am honoured and thrilled to be presenting such a huge show on Radio 1. The broadcasters who have gone before me have left an impressive trail and I hope to carry that on. Doing this job is an absolute joy and to now have the opportunity to broadcast Monday to Friday is something that I am so grateful for. I can't wait to introduce a Live Lounge artist for the first time!"