The charity campaigner contacted British station Heart FM Sussex on Saturday (24.04.10) to try and get her hands on two pairs of £110 tickets to the 'Million Dollar Bill' singer's show in London on Wednesday (28.04.10).
Heather called into Paul Hayes' show and was randomly selected from dozens of hopefuls to be put through live.
Describing herself as "Heather from Hove" who was "just about to take her dog for a walk", the 42-year-old blonde successfully identified The Missing word to a Whitney song to win the tickets.
Heather then screamed: "That's wonderful. Thank you so much. I can take my girlfriend. I'm really excited."
Despite saying she was taking a friend during the call, Heather has now claimed she wanted to win the tickets for an ex-partner's 82-year-old mother.
Heather - whose former husband is Sir Paul McCartney - tweeted: "Whitney Houston sold out, called Heart FM for a laugh to try and win tickets for my ex's 82 yr old Mega fan Mum and WON, SHE IS SO HAPPY xx (sic)"
DJ Paul Hayes admits he didn't realise he had a celebrity on the line until afterwards.
He said: "It suddenly clicked - the accent, the address she gave me and, of course, the name. It just shows you never know who is out there listening."
Heather was awarded £24.3 million in her divorce settlement from Paul in 2008, but recently claimed she had given away most of it to charity.
She said: "Most of it's been given to charity, gone into ethical businesses or paid for a couple of properties for my daughter's future security. I could never sit with millions of pounds in the bank that could make matters change."