Adding new column to an existing dataframe at an arbitrary position

Question

df = pd.DataFrame(np.arange(15).reshape(5,3), columns = ['a', 'b', 'c'])
df

Output:

    a   b   c
0   0   1   2
1   3   4   5
2   6   7   8
3   9  10  11
4  12  13  14

Now, I want to add a new column 'new' to df as below:

df
    a  new   b   c
0   0   11   1   2
1   3   12   4   5
2   6   13   7   8
3   9   14  10  11
4  12   15  13  14

How this can be achieved using pandas?