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The 22-year-old announced her pregnancy last week, confirming that she is expecting her first child with fiancé Thomas Cohen.
"We've just bought a beautiful three-bed Victorian house in London," Geldof told the Sunday Mirror.
"I've spent the whole of today trying to sort getting a mortgage - it's such adult territory! I can't wait to start decorating it and I'm obsessed with buying vintage sofas off eBay for £200. I'm just a really happy girl."
Geldof got engaged to Cohen in December last year but insisted she will wait a few years before getting married.
She was previously married to Max Drummey, tying the knot in Vegas in 2009. The couple divorced after just six months together.
