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Meanwhile, Frank covered up in a black jacket and baggy pants, and completed his outfit with boots and a beanie.
The 55-year-old, whom Nikki was first seen kissing in August, carried two tote bags as they walked back to their car.
Fit: The 39-year-old wore a white cropped singlet over her sports bra, which revealed a glimpse of her toned abs and drew attention to her sinewy biceps
Prized fighters: The couple were seen leaving Fortune Gym on Melrose Avenue, where they do boxing training with LA-based Australian trainer Justin Fortune (left)
The couple were seen leaving Fortune Gym on Melrose Avenue, where they do boxing training with LA-based Australian trainer Justin Fortune.