09/15/2011 at 05:15 PM EDT
And baby makes two.
star January Jones
welcomed her first child on Tuesday, her rep confirms to PEOPLE.
Son Xander Dane Jones and the new mom are "doing great," the rep says.
Jones, 33, chose to keep the sex of her baby under wraps
, remarking "it's going to be a surprise for me" during a June interview.
The actress announced the pregnancy
in April. A source told PEOPLE at the time, "She’s really looking forward to this new chapter in her life as a single mom."
Reporting by BLAINE ZUCKERMAN