06/06/2012 at 11:25 PM EDT
Danica McKellar is ending her marriage.
The former Wonder Years
star, 37, has filed for divorce from composer Mike Verta, whom she married in 2009.
The couple, who have a prenuptial agreement, separated on June 1, according to court papers filed Monday in L.A. Superior Court. McKellar cites irreconcilable differences as the reason for the split.
McKellar, who played Winnie Cooper on the popular '90s TV show, has a 1½-year-old son, Draco Verta
, with Verta. McKellar is seeking joint custody.
McKellar later posted a message on Twitter:
"Thank you so much for all your love and support during a tough time!"
Following their La Jolla, Calif., nuptials, McKellar's sister gushed
to PEOPLE that the actress had "married the love of her life."
The couple's wedding song was "Forever in Love with You," which was written by Verta for the occasion.
McKellar is represented by attorney Mark S. Patt of prominent law firm Trope and Trope, which has represented Nicole Kidman
, Britney Spears
and Melanie Griffith, among others.