Use RectangleGeometry to clip Image
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<StackPanel Grid.Column="1" Grid.Row="1" Grid.RowSpan="2"
Margin="2,2,2,2">
<Image Source="c:/image.jpg" Width="100" Height="75" Margin="2,2,2,8"/>
<Image Source="c:/image.jpg" Width="100" Height="75" Margin="2,8,2,2">
<Image.Clip>
<RectangleGeometry Rect="0,0,100,75" RadiusX="25" RadiusY="25"/>
</Image.Clip>
</Image>
</StackPanel>
</UserControl>
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