JUST ADDED: 5 Seconds of Summer will be rocking the stage at this year's iHeartRadio Music Festival Village in Las Vegas! The band sat down with Ryan Seacrest to break the news. Click here to buy your tickets now, before they sell out!
Sources connected with the couple tell TMZ ... Mariah and Nick have been living in separate houses in NYC since May. He sees the kids but that's the extent of their contact.
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