The bubbly blonde, who previously dated Jim Carrey, is said to have began a relationship with the 'New Kids On The Block' singer, 43, reported Contactmusic.
"Yes, they recently started dating and are having a lot of fun. They had a blast 4th of July hanging out with a bunch of their friends," a source said.
The 40-year-old single-mother, who has a son Evan, nine, with her ex-husband John Mallory Asher, recently admitted she would like to find a new boyfriend.
Wahlberg, who has two sons, split from his wife Kim Fey after nine years of marriage in 2008.