Reese Witherspoon is ''mortified'' after her arrest for disorderly conduct.

The 'Mud' actress was picked up by police officers in Atlanta last week while her husband Jim Toth was arrested on suspicion of DUI and friends of the 37-year-old mother-of-three say she can't believe she let things get so out of control.

A source told People: ''She's a fun girl who likes to have a good time and let loose every now and then. What's shocking is she didn't rein it in enough to keep herself out of trouble. It was a really bad decision on both their parts and trust me, they're evaluating that and they will make damn sure it doesn't happen again.''

Reese - who has seven-month-old son Tennessee with Jim - is also worried about how her kids Ava, 13 and Deacon, nine, from her previous marriage to Ryan Phillippe, will cope with the scandal.

The insider added: ''She is happy to be home with her kids again

''She didn't feel good about being away from them after the news of her arrest broke.

''Her kids are everything to her.''

The couple are due in court in Atlanta on their respective charges on May 22 and May 23.