88 faces decision as overpair on flop

[sixsixtie]

Villain posted the hand before and I have 0 hands on him.
Party Poker
No Limit Holdem Ring game
Blinds: $0.05/$0.10
7 players
Converter

Pre-flop: (7 players) Hero is UTG with 8[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/diamond.gif[/img]
Hero calls, UTG+1 calls, MP1 calls, CO calls, <font color="#cc0000">Button raises to $0.8</font>, 2 folds, Hero calls, UTG+1 calls, MP1 folds, CO calls.

Flop: 6[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] ($3.45, 4 players)
<font color="#cc0000">Hero bets $2.75</font>, <font color="#cc0000">UTG+1 raises all-in $9.1</font>, 2 folds, Hero ??