Miley & Justin: Sleepover At My Place!

1/23/2009 5:20 PM PST BY TMZ STAFF
Usually, 16-year-old girls have sleepovers with other 16-year-old girls -- not 20-year-old men.

After freeloading at Koi last night, both Miley and manfriend Justin Gaston hightailed it back to her house to "sleep."

... and mom and dad were OK with that?!