The 23-year-old reality TV star and Calvert, 24, also agreed to the custody terms, which gives Messer custody of the couple's daughter, Adalynn, two.
Calvert will have visitation rights, reported Us Magazine.
The young mother is currently in a treatment center and did not attend the hearing, which her lawyer was present for.
Messer checked into a treatment facility for a 30-day programme to deal with depression and stress, a source said.
Messer and Calvert's union has been a rocky one, with rumours of infidelity plaguing the couple during their three-year marriage, and unconfirmed reports of drug use by her.