Longest Cat: The title of "Longest Cat" goes to Stewie, a Maine Coon who measured 48.5 inches (123 cm) long from nose to tail in 2010.
Heaviest Cat: The heaviest cat ever recorded was Himmy, a Maine Coon who weighed in at 38.3 kg (84.5 lbs) in 1986.
Tallest Cat: The tallest cat ever recorded was Stewie (the same cat mentioned above!), who also held the title of tallest cat, standing 19.05 inches (48.4 cm) tall in 2010.
So, depending on what you consider "biggest," you have a few different answers!