We've been following their romantic rendezvous since Tuesday night at Sunset Tower, when we caught John and Jen, XCLUSIVELY, leaving the Tower Bar together in these never-seen pix ...

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And UPDATE! - JOHN & JEN ARE TOGETHER RIGHT NOW!!!! WE'LL HAVE MORE NEWS ON THAT FOR YOU TOMORROW ...



Then on Wednesday, we saw John at his Palisades home looking a little less than handsome ...

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... before heading out that evening to the Grand Havana cigar club in Beverly Hills to celebrate his b'day with Jen. And then it was back to Jen's to party some more and spend the night!



On Thursday, Don Juan was at the studio, hard at work with Benji Madden ...

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And he was back in the studio, in the SAME clothes, on Friday night after spending ANOTHER night with his g-friend (and, apparently, forgetting his overnight bag!) ...

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While, on the same night, Jen was at home, awaiting John's visit. He stopped by her place for just 30 minutes after his studio session, so Jen stayed home alone ...

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But the two did NOT spend the night together and, instead, went their separate ways on Friday night AND on Saturday, when we spotted Jen, sans John, at a Courteney Cox's house ...

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