News 'The Mentalist' Star Engagement News! Published 12:25 PM PDT, October 9, 2012 Warner Bros. Owain Yeoman of The Mentalist is officially engaged! Video: How Real Is 'The Mentalist?' The 34-year-old Welsh actor popped the question to his 27-year-old jewelry designer girlfriend Gigi Yallouz. The happy couple have been dating since the start of this year and are set to be married in June of 2013.Simon Baker Plays 'True or False' Yeoman plays Agent Wayne Rigsby on CBS's The Mentalist and also made his mark on HBO's Generation Kill and FOX's Kitchen Confidential.