Part of existing among psychics and living gods is the fact that information has a way of getting out, here.

[It's both a sort of confession and a sort of warning. Light isn't in danger of having his secret betrayed by L, who has something to lose if concerned friends want to keep them apart, but there are myriad other ways it could happen, in spite of all care.]

I never would have said anything, but since I can have a birthday party here, and there are people who want to throw one... I do want you there, Light.

[He names the address of the house it'll be at. Not Paul's, or anyone's, but outfitted for the sole purpose of this event.]