James Van Der Beek, girlfriend expecting babyIt's time for diaper duty. 'Dawson's Creek' star James Van Der Beek and girlfriend Kimberly Brook are expecting their first child together this fall.

"Yes, it's true -- the woman I love and I are expecting our first child... currently experiencing joy on levels I never knew existed," he wrote on Twitter.

The couple met last July. Van Der Beek and ex-wife Heather Ann McComb split in April 2009.

Van Der Beek is currently starring in NBC's new medical drama 'Mercy'.