How do I center-align listview items?

How do I center listview items within a Xamarin.Forms app?

I have the following code:

    <ListView Grid.Row="1" Grid.Column="0" ItemsSource="{Binding Results}" HorizontalOptions="Center">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <ViewCell.View>
                        <Grid HorizontalOptions="Center">
                            <Grid.RowDefinitions>
                                <RowDefinition />
                            </Grid.RowDefinitions>

                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="auto" />
                                <ColumnDefinition Width="auto" />
                            </Grid.ColumnDefinitions>

                            <Label Grid.Row="0" Grid.Column="0" Text="{Binding FirstName}" />
                            <Label Grid.Row="0" Grid.Column="1" Text="{Binding LastName}" />
                        </Grid>
                    </ViewCell.View>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>