The 47-year-old "Harry Potter" actress described the speculation as 'absolute nonsense', insisting Burton, 55, and the blonde were among a group of family members and friends, reported Daily Express.
"This is absolute nonsense, the pictures were taken whilst they were out and the large group includes family, friends and work colleagues," the actress' representative said.
The denial came after Bonham Carter was pictured looking tired as she emerged from a friend's car in North London, hours after the photographs of her partner were published.
Burton, who has been in a long term relationship with Bonham Carter for 12 years, was caught on camera as they returned to their car after watching cult film "The Wicker Man".
The couple were last seen together in public in March this year when they attended an event with their children Billy, nine, and five-year-old Nell.