Jlo is chubby, not pregnant.

Everyone gets older, even Jlo.
Ninemsn:
Jennifer Lopez is not pregnant — despite a raft of recent reports to the contrary.
Husband Marc Anthony rejected the pregnancy rumours in a press statement yesterday, celebrity blogger Perez Hilton reports. "Everyone calls about this every month with the hopes that they'll hit the mark — but no," Anthony's publicist said.
International gossip was rife this week with reports the voluptuous singer was expecting her first child.