This info was posted earlier, but here's the official press release from CBS...
via press release:
CBS ORDERS MORE EPISODES OF FRESHMAN COMEDY "ACCIDENTALLY ON PURPOSE"
On the heels of last night's broadcast which matched a series high adult 18-34 rating, CBS has ordered an additional five episodes of its freshman comedy ACCIDENTALLY ON PURPOSE, bringing its season order to 18.
ACCIDENTALLY ON PURPOSE is averaging 8.04 million viewers, 3.1/07 in adults 18-49 and 3.7/08 in adults 25-54 in its Monday (8:30-9:00 PM) time period, according to Nielsen most current ratings.
Last night's broadcast, against game 5 of the World Series, matched its series high in adults 18-34 (2.5/07).
ACCIDENTALLY ON PURPOSE, starring Jenna Elfman, Ashley Jensen, Jon Foster, Grant Show, Lennon Parham and Nicolas Wright, is produced by CBS Television Studios. Claudia Lonow, Lloyd Braun, Gail Berman and Gene Stein are executive producers.