8:55 AM PT -- Sources close to the situation tell TMZ ... Tristan showed up alone to the restaurant and he exchanged hugs with Kim when he saw her. We're told the embrace was cordial ... Tristan actually sat down with her crew and hung around for a bit.
Our sources say even though Khloe's not with Tristan, they consider him family because he's Khloe's baby daddy. We're told cameras were rolling for 'KUWTK.'
Kim and some buds -- La La Anthony and Jonathan Cheban -- hit the town Wednesday night and ended up at arguably the best seafood place in the city -- Milos. Unbeknownst to her, Khloe's ex was also in the mood for a little surf action.