By Jailene Cuevas The former late night talk show host Jay Leno and his wife Mavis Leno made a rare appearance. The pair stepped out and walked the red carpet for the premier of Jerry Seinfeld’s Netflix film, Unfrosted, in Los Angeles on Tuesday. Jay was seen all smiles with Mavis, who cosied up to her husband. Mavis was wearing a paisley print top with grey pants and brunette hair styled down. Jay wore a grey suit with a light blue collared button up under. The two have been married for over four decades and their marriage have been tested. Mavis has been battling dementia and her husband was…