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In Hollywood, there are two kinds of couples. There are those like Chrissy Teigen and John Legend, Nicole Kidman and Keith Urban, A-Rod and JLo — the type to happily flaunt their love for each other on social media and the red carpet. (Side note: Is it ever not date night for Jennifer Lopez and her new man?)

Then, there is the polar opposite. Famous duos who refuse to pose together even when they walk the same red carpet, the kind who manage to have secret weddings and even secret babies. In fact, some couples are so covert, there's hardly any photo evidence of their relationship at all. Come on, Katie and Jamie, throw us a bone!

Think about it, can you picture Brooke Shields' husband? How about Julia Roberts' other half for the past two decades? Or the father of Adele's child? Didn't think so. Which is no small feat for these hugely famous A-listers.

Here, we've rounded up the most hush-hush Hollywood romances — take a look, chances are many of these lovebirds will be news to you.