Gwen Stefani & Gavin Rossdale: Hoops Spring Eternal

Gwen Stefani and Gavin Rossdale put their differences aside in the name of basketball ... and co-parenting.

For the first time since their divorce, the exes were seen together Wednesday -- just feet apart -- at their son Kingston's hoops game. There were smiles, from Gavin at least, but they were hardly chummy. More like cordial.

Exes playing nice ... it's catching on.