Justin Bieber — Flirting with Miley Cyrus

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Justin Bieber partied with Miley Cyrus at an L.A. hotspot this weekend … did some hardcore flirting … and sources tell TMZ the two left the joint together around 2 AM.

TMZ obtained pics of JB and Miley hanging out at Beacher’s Madhouse at the Roosevelt Hotel in L.A. early Sunday morning … a standard celeb late-night hangout.

We’re told Miley arrived first (she’s a regular at the place) … with Justin showing up around 1:50 AM and heading straight for Miley’s desk.

We’re told the two hung out for roughly 15 minutes … laughing and flirting together … and they both left the theater at the same time, just after 2 AM. It’s unclear where they went after the show.

Hours before the late-night date, Bieber’s leopard-blemished Audi was seen leaving Miley’s L.A. home on Saturday.

FYI — Miley and Bieber have been friends for years … but it seems like there might be something more going on between the two.