Masembryanthemum

The only little flower in our garden at the moment!! :-( I really dunno what made it flower now!

I know it belongs to the family 'Masembryanthemum', but I can't find this exact little beauty, I am sure Z will be able to assist me!! ;-)

Late Edit:
My dear Z has identified it for me!! It is Portulaca grandiflora! Thx Z!