The singer - who revealed at her wedding to Sam Cooper earlier this month that she is pregnant - admits she's suffering from one the most common side effects of pregnancy and can't stop vomiting, even in public places.
She tweeted: "Aah the joys of pregnancy, just got papped vomiting on Bond Street. (sic)"
As well as being sick, Lily is also having hot flushes.
She wrote: "Oooh, its proper raining in Gloucestershire today. Does not feel like July at all, but that's good cause I'm preggers and hating the heat. (sic)"
Lily is thought to be around 19 weeks pregnant and new husband Sam decided to include the announcement in his speech at their wedding after they went for the 12-week scan and were told the baby is developing healthily.
The happy news came seven months after the 26-year-old singer tragically lost her and Sam's baby six months into the pregnancy last November.
Following their tragic loss, Lily and Sam received support from neighbours in her village of Cranham, Gloucestershire, South West England, and recently revealed that's why they decided to get married in the local church there.
She said: "People wouldn't have thought I'd have a church wedding, but since I had the really traumatic experience last year, our local community all pitched in.
"We hadn't been there long, but after the news got out we received flowers and really heartfelt, beautifully written cards."
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