X17 FIRST - Jamie Lynn Is In The House!!!!!!

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The youngest Spears arrived in LA this afternoon and headed STRAIGHT to sister Brit's house to introduce little Maddie to her aunt.

But the REAL surprise is that Maddie got to meet her ex-step-half uncle, or whatever he is - Kevin!

KFed was at Britney's to pick up Sean and Jayden and, like he did for the first time last week, he went inside and hung out for a bit -- in fact, he appeared to stay JUST to wait for JL so HE TOO could meet the baby. He was inside for a total of about 45 minutes. It's the third time in a week he's gone inside WITHOUT a bodyguard to chill!

SO much to think about! A Britney/Jamie Lynn reunion; an aunt meeting her niece for the second time after the birth; and Brit and Kevin spending time together!!!

We'll have some pix of Kevin leaving the house coming in a bit ... stay tuned!