Marc Anthony -- Partying Like a Single Guy

[NelsonG]

Filed under: [url="http://www.tmz.com/person/marc-anthony/"]Marc Anthony[/url], [url="http://www.tmz.com/category/photo-galleries/"]Photo Galleries[/url]

[b][url="http://photos.tmz.com/galleries/muy_caliente"][img]http://ll-media.tmz.com/2011/10/28/1028-marc-anthony-launch-ex-credit.jpg[/img][/url]
Marc Anthony[/b] doesn't need [b]J.Lo[/b] to have a good time ... 'cause dude seemed to be having a blast in Costa Rica this week while some chick planted a big, fat kiss on his cheek.

Anthony -- who separated from his baby mama back in July -- threw a HUGE party a few days ago to launch his new TV show ... a Latin singing competition called "[b]¡Q’Viva! The Chosen[/b]," which is set to debut in early 2012.

We're told Marc got behind the DJ booth for a while a spun a couple of records -- and later took a couple of cozy pictures with a woman named Dianna Perez, who's part of the crew. 

It happened to be Dianna's birthday that night ... wonder if she got what she wished for?!

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