Fifi Box reveals pregnancy joy

Radio presenter Fifi Box has revealed she is pregnant with her second child.

The 41-year-old took to Instagram to deliver what is possibly the cutest baby announcement ever.

In an ecstatic post, the bubbly star shared the moment with her five-year-old daughter Trixie, saying she and her little girl were "over the moon".

Box revealed in her post that she was expecting her child after undergoing IVF with an anonymous sperm donor.

She heaped praise on her "amazing" IVF doctor, who helped her achieve her dream.

"After a series of egg retrievals and freezing, last year I started the process to become pregnant via an anonymous donor," she said.

Box gave birth to Trixie, whose father is former Ironman Grant Kenny, in 2013.

The pair split after a brief romance in 2012 but are reportedly on good terms, with Kenny regularly visiting his daughter in Melbourne.

The TV personality said she was "blessed" to be having a "much-wanted sibling" for her daughter.

"I know the value of this miracle because I have seen first hand the heartbreak, tears and sacrifices so many women and couples suffer on their IVF journeys and my heart goes out to those who are facing that pain and struggle," Box wrote in her emotional post.

"It is not lost on me that I am one of the lucky ones."