Got it from the net, Red Box + Pavillion.
Sat/Sun/Public Hols 1500-1800 Hi tea buffet RM32++; 1800-midnite Dinner buffet RM60++
I believe they charge for the F&B and that includes the room depending on the size of group.
Even if it's not for karaokeing, there are quite a number of cool casual places to hang out at Pavillion, level 3 al afresco - la bodega, starbucks, carlos, athena, etc; level 4 - rainforest, dome, theobroma, etc; centre court - coffee bean, dome
Since we're in this TT topic, I would also like to suggest other outside 'cangkir' places that we may want to consider for a change of ambience once in awhile.
- Modestos at Cap Square, Jalan Munshi Abdullah, KL (restaurant/bistro)
- Skybar, Traders Hotel (lounge/bar, chill out place with really awesome view from 33rd floor)