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Even at the VMAs, Kourtney Kardashian and Travis Barker are all about PDA. The couple made their red carpet debut Sunday ahead of the the 2021 MTV event at Barclays Center in Brooklyn. Kardashian, 42, and Barker, 45, couldn’t keep their hands or lips off of each other while posing for photographers — just like their friends Machine Gun Kelly and Megan Fox. The Blink-182 drummer wore a black suit without a shirt underneath, baring his many tattoos, while the “Keeping Up with the Kardashians” alum wore a black leather dress. She first teased her VMAs appearance by wearing the iconic Dolce…