Channel 5 weather presenter Sian Welby is joining Heart to host the evening show, Monday to Thursday.
Kat Shoob is also taking over the late show on the network.
Sian starts next week, Monday 16th January, replacing Roberto who has been on the show since 2012.
The news was announced on Heart’s Twitter account on Friday afternoon, with listeners responding to ask where Roberto is going.
Roberto posted on Instagram today that he is “Taking the personal trainer qualification up a notch with an advanced certificate in weight loss management”, and tweeted that he was hosting his last evening show yesterday.
Heart evenings is Sian’s first radio show, joining the industry from television where she is know for presenting the weather on Channel 5 and The Health Lottery show.
Sian also a columnist for OK! Magazine with a “Wellbeing with Welby” column.