The couple announced their breakup on Thursday.
The couple has recently been more open about their romance after being spotted at several public events.
The young model also posted a set of pics to her Instagram Story chronicling her Valentine's Day wishes.
A source told ET that Sweetin celebrated her birthday with her new man last month.
The 33-year-old reality star also revealed her Valentine's Day plans.
The two were married for a year and a half, and share two daughters.
The couple attended Louis Vuitton's celebration of Jasper Johns: Something Resembling Truth at The Broad on Thursday.
The British rocker's Instagram post on Thursday is rare for the couple, who were first spotted together in March 2017.
The 25-year-old model also opened up about being a Sports Illustrated rookie while speaking with ET at the 2018 amfAR Gala in New York City on Wednesday.
Laich admitted he was measuring ring sizes before the 'DWTS' pro was even his girlfriend!
The 60-year-old TV host posted the PDA pic to Instagram on Wednesday.
The happy couple were spotted packing on the PDA following a night out together at the GRAMMYs.
The pair flaunted their romance on Instagram on Monday.
Love on the red carpet!
