Funnyman Will Arnett proved there are no hard feelings between him and his estranged wife Amy Poehler at the weekend (15-16Sep12) by joining the actress to celebrate her 41st birthday. The comedy couple announced earlier this month (Sep12) it was splitting after nine years of marriage, but it appears the break-up has been more than amicable and the Arrested Development actor was spotted attending Poehler's Los Angeles bash with their two boys, Archie and Abel.