Christina Milian -- All I Want for Christmas From Lil Wayne Is ...

Christina Milian has been tight-lipped about her possible relationship with Lil Wayne, but she did let a few things slip when we asked her about the holidays.

Milian was out to dinner Wednesday at Boa Steakhouse with Karrueche Tran when we brought up Weezy's crazy gift-giving skills ... and asked what Christina was expecting under the tree this year?

Watch the video for her answer -- or watch just to see Karrueche and Christina ... who had a near nip-slip.