Jennifer Aniston. (AP File photo)

Jennifer Aniston has slammed American tabloid reports she enjoyed a secret rendez-vous with her ex-husband Brad Pitt.

The former couple, which split in 2005, reportedly reunited recently in an "intimate 1am rendez-vous" at New York City's Gramercy Park Hotel - following their rumoured reconciliation in April, according to U.S. tabloid Star.

The reports fuelled break-up rumours between Pitt and partner Angelina Jolie.

Pitt has denied the rumours, and now Aniston's spokesperson has stepped in to blast the allegations, calling the story a "complete fabrication". And a spokesperson for the hotel has also defended the star, insisting the reports are "not true".