Pregnant pop star Lily Allen may have another big announcement on the way - if pictures of her flashing what looks like an engagement ring are anything to go by. The British singer, 22, announced she is expecting a baby with Chemical Brothers star Ed Simons, 37, earlier this week (19Dec07). And now speculation the pair are set to wed is rife. Allen fuelled rumours by stepping out in London on Thursday (21Dec07) wearing a dazzling gold and diamond ring on her engagement finger. However her spokesman was keen to play down the gossip. Allen has been dating Simons, 37, since September (07).