Hollywood couple Jennie Garth and Michael Shimbo have ended their three-month romance, E! News reported Tuesday. The actress and the media executive traveled to Austin, Texas, last weekend to watch Formula One's U.S. Grand Prix. However, while they were there, they argued and decided to call it quits, the report said. Garth, 41, finalized her divorce from actor Peter Facinelli, 39, in June after separating in March 2012. They are the parents of three daughters -- Luca, 16, Lola, 11, and Fiona, 7.