If you suspect those co-workers are more than just co-workers – here's what to look for...

They may think they’re being discreet – but people having office romances usually blow their cover.

Here are a few dead giveaways:

• John and Marsha used to chat in the lunchroom or ride the elevator together – but now they go out of their way NOT to. Hmmm.

• Marsha lets everyone know she’s leaving now. John makes a point of announcing he’s got more work to do - a little too INconvenient.

• John used to love those after-work get-togethers – and Marsha used to have a life too. Now they’re both workaholics. What a coincidence.

• Marsha used to be happy to see you – and you could always count on John for a good joke. Now, if you enter a room where they happen to be, Marsha is dumbstruck and John looks sick.

• The first time John and Marsha’s vacation days coincided seemed like a coincidence. The third time’s a trend.

• You always knew John was a huge Yankee’s fan – so what’s with the Derek Jeter bobble head on Marsha’s desk?

• John was always a stylish guy. Now his shirt is buttoned wrong and Marsha’s sweater is inside out!