Reality TV star Kerry Katona has been served with legal papers from her ex-husband demanding temporary custody of their two daughters, say reports.

According to the Sunday Mirror the troubled star has until Thursday to respond to Brian McFadden otherwise he will apply for full custody of Molly, eight, and six-year-old Lilly Sue.

The former Westlife member wants Katona to prove she is a fit mother to their two girls, following her recent drugs scandal.

“Kerry is terrified of losing her girls,” a source told the paper. “She’d heard Brian was thinking about taking custody, but had heard nothing.

“Suddenly a letter landed on her doorstep from Brian’s lawyers demanding intermediate custody while she sorts herself out.

“Her children are the most important thing to her, the last thing she needs is a bitter custody battle with Brian – it could destroy her.”

McFadden lives in Australia with his fiancee, singer Delta Goodrem, but recently said he would be prepared to move back to Ireland for the sake of his children.

Katona – a former winner of I’m A Celebrity…Get Me Out Of Here! has been in the headlines since photos of her snorting cocaine appeared in the tabloids last month.

She was later cautioned by police over the incident.